CN106544679B - A kind of corrosion inhibiter for preventing Aldecor from corroding in chloride corrosive medium - Google Patents
A kind of corrosion inhibiter for preventing Aldecor from corroding in chloride corrosive medium Download PDFInfo
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- 238000005260 corrosion Methods 0.000 title claims abstract description 93
- 230000007797 corrosion Effects 0.000 title claims abstract description 91
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 title claims abstract description 28
- 229910052684 Cerium Inorganic materials 0.000 claims abstract description 20
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical class [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 claims abstract description 14
- 235000019832 sodium triphosphate Nutrition 0.000 claims abstract description 11
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 7
- 229910002651 NO3 Inorganic materials 0.000 claims abstract description 5
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims abstract description 5
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims abstract description 3
- ZMIGMASIKSOYAM-UHFFFAOYSA-N cerium Chemical compound [Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce] ZMIGMASIKSOYAM-UHFFFAOYSA-N 0.000 claims abstract 4
- -1 Sodium nitrite compound Chemical class 0.000 claims description 11
- 235000010288 sodium nitrite Nutrition 0.000 claims description 9
- VYLVYHXQOHJDJL-UHFFFAOYSA-K cerium trichloride Chemical compound Cl[Ce](Cl)Cl VYLVYHXQOHJDJL-UHFFFAOYSA-K 0.000 claims description 8
- UNXRWKVEANCORM-UHFFFAOYSA-I triphosphate(5-) Chemical compound [O-]P([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O UNXRWKVEANCORM-UHFFFAOYSA-I 0.000 claims description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims 2
- 239000010452 phosphate Substances 0.000 claims 2
- 229910052708 sodium Inorganic materials 0.000 claims 2
- 239000011734 sodium Substances 0.000 claims 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims 1
- 239000003112 inhibitor Substances 0.000 abstract description 38
- 229910000922 High-strength low-alloy steel Inorganic materials 0.000 abstract description 14
- 239000001488 sodium phosphate Substances 0.000 abstract description 9
- 229910000162 sodium phosphate Inorganic materials 0.000 abstract description 9
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 abstract description 8
- 150000001785 cerium compounds Chemical class 0.000 abstract description 7
- 229910052761 rare earth metal Inorganic materials 0.000 abstract description 6
- 235000021317 phosphate Nutrition 0.000 abstract description 5
- 150000003013 phosphoric acid derivatives Chemical class 0.000 abstract description 5
- 230000005764 inhibitory process Effects 0.000 description 17
- 229910000851 Alloy steel Inorganic materials 0.000 description 16
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 16
- 229910004664 Cerium(III) chloride Inorganic materials 0.000 description 6
- 239000000956 alloy Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000002401 inhibitory effect Effects 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 229910001424 calcium ion Inorganic materials 0.000 description 3
- 239000010962 carbon steel Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 239000013535 sea water Substances 0.000 description 3
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 2
- 229920000388 Polyphosphate Polymers 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000002149 energy-dispersive X-ray emission spectroscopy Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 238000002161 passivation Methods 0.000 description 2
- 239000001205 polyphosphate Substances 0.000 description 2
- 235000011176 polyphosphates Nutrition 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- 241000519995 Stachys sylvatica Species 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 239000001506 calcium phosphate Substances 0.000 description 1
- 229910000389 calcium phosphate Inorganic materials 0.000 description 1
- 235000011010 calcium phosphates Nutrition 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000004210 cathodic protection Methods 0.000 description 1
- UNJPQTDTZAKTFK-UHFFFAOYSA-K cerium(iii) hydroxide Chemical compound [OH-].[OH-].[OH-].[Ce+3] UNJPQTDTZAKTFK-UHFFFAOYSA-K 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000012847 fine chemical Substances 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 229910000398 iron phosphate Inorganic materials 0.000 description 1
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 230000010534 mechanism of action Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- HWGNBUXHKFFFIH-UHFFFAOYSA-I pentasodium;[oxido(phosphonatooxy)phosphoryl] phosphate Chemical compound [Na+].[Na+].[Na+].[Na+].[Na+].[O-]P([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O HWGNBUXHKFFFIH-UHFFFAOYSA-I 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- TVXXNOYZHKPKGW-UHFFFAOYSA-N sodium molybdate (anhydrous) Chemical class [Na+].[Na+].[O-][Mo]([O-])(=O)=O TVXXNOYZHKPKGW-UHFFFAOYSA-N 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
- C23F11/18—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using inorganic inhibitors
- C23F11/187—Mixtures of inorganic inhibitors
- C23F11/188—Mixtures of inorganic inhibitors containing phosphates
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- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
一种防止高强度低合金钢在含氯化物腐蚀介质中腐蚀的缓蚀剂属于缓蚀剂领域。其中磷酸盐类浓度范围300～600ppm；三聚磷酸钠含量200～400ppm；磷酸钠含量为100～200ppm；亚硝酸钠类化合物，其浓度为20～60ppm；铈类化合物，其浓度为30～80ppm；铈类化合物为铈的氯化物、硫酸盐或硝酸盐，且铈的价态为+3价。本发明开发、研制了一种含稀土元素3价铈的缓蚀剂，用于防止高强度低合金钢在含氯化物腐蚀介质中的腐蚀，以满足海洋资源开发过程中海洋工程、船舶工程的需要。A corrosion inhibitor for preventing high-strength low-alloy steel from corroding in a chloride-containing corrosive medium belongs to the field of corrosion inhibitors. Among them, the concentration range of phosphates is 300-600ppm; the content of sodium tripolyphosphate is 200-400ppm; the content of sodium phosphate is 100-200ppm; the concentration of sodium nitrite compounds is 20-60ppm; the concentration of cerium compounds is 30-80ppm ; The cerium compound is chloride, sulfate or nitrate of cerium, and the valence state of cerium is +3. The present invention develops and develops a corrosion inhibitor containing rare earth element trivalent cerium, which is used to prevent the corrosion of high-strength low-alloy steel in chloride-containing corrosive media, so as to meet the needs of ocean engineering and ship engineering in the development of marine resources. need.
Description
技术领域technical field
本发明属于利用缓蚀剂，防止金属或者合金材料在含氯化物介质中腐蚀的技术。即采用一种含有稀土元素铈的缓蚀剂，防止高强度低合金钢在含氯化物腐蚀介质中的腐蚀，其缓蚀率达到95％以上。The invention belongs to the technique of using a corrosion inhibitor to prevent metal or alloy materials from corroding in a chloride-containing medium. That is, a corrosion inhibitor containing rare earth element cerium is used to prevent the corrosion of high-strength low-alloy steel in the chloride-containing corrosive medium, and its corrosion inhibition rate reaches more than 95%.
背景技术Background technique
相对于碳钢在氯化物腐蚀介质中的腐蚀，高强度低合金钢在氯化物腐蚀介质中的平均腐蚀速率虽然较低些，但是其腐蚀仍然不能够忽视。防止金属材料在氯化物腐蚀介质中的方法很多，比如有机涂层、阴极保护和缓蚀剂防护技术。由于缓蚀剂技术在应用实践中，特别是用于循环管系的内防腐，具有方便、经济、效率高等特点。所以，缓蚀剂防腐技术具有广泛的应用前景。Compared with the corrosion of carbon steel in chloride corrosion medium, although the average corrosion rate of high strength low alloy steel in chloride corrosion medium is lower, its corrosion still cannot be ignored. There are many ways to prevent metal materials in chloride corrosive media, such as organic coating, cathodic protection and corrosion inhibitor protection technology. Because the corrosion inhibitor technology is used in practice, especially for internal anticorrosion of circulating piping systems, it has the characteristics of convenience, economy, and high efficiency. Therefore, corrosion inhibitor anti-corrosion technology has broad application prospects.
缓蚀剂种类很多，包括有机缓蚀剂、无机缓蚀剂和有机无机复合型缓蚀剂三大类。按照缓蚀剂的作用机制也可以分为阳极型缓蚀剂、阴极型缓蚀剂和混合型缓蚀剂三种类型。当前，碳钢在自来水中的缓蚀剂的研究和工业应用比较普遍，并且其有效组分主要为磷酸盐、硝酸盐等无机化合物和有机磷酸酯、有机胺等有机化合物，其腐蚀效率一般在85％以上。对于碳钢在氯化物腐蚀介质中的缓蚀剂，据文献报道，主要为含3价铝离子的无机型缓蚀剂，其缓蚀率达90％以上。但是，对于高强度低合金钢在含氯化物腐蚀介质中的缓蚀剂，未见研究报道，更未见其工业应用。There are many kinds of corrosion inhibitors, including organic corrosion inhibitors, inorganic corrosion inhibitors and organic-inorganic composite corrosion inhibitors. According to the mechanism of action of corrosion inhibitors, they can also be divided into three types: anodic corrosion inhibitors, cathodic corrosion inhibitors and mixed corrosion inhibitors. At present, the research and industrial application of corrosion inhibitors for carbon steel in tap water are relatively common, and their effective components are mainly inorganic compounds such as phosphates and nitrates and organic compounds such as organic phosphates and organic amines. More than 85%. For the corrosion inhibitor of carbon steel in the chloride corrosion medium, according to literature reports, it is mainly an inorganic corrosion inhibitor containing trivalent aluminum ions, and its corrosion inhibition rate is over 90%. However, there are no research reports on corrosion inhibitors for high-strength low-alloy steels in chloride-containing corrosive media, let alone their industrial applications.
稀土元素，俗称工业“味精”。广泛用于精细化工、催化剂等行业。近年来，关于稀土元素用于防腐缓蚀剂的研究，已经成为新型缓蚀剂研究的热点。尽管如此，仍然未见用于高强度低合金钢在氯化物腐蚀介质中的防腐缓蚀剂报道。为此，本发明开发、研制了一种含稀土元素3价铈的缓蚀剂，用于防止高强度低合金钢在含氯化物腐蚀介质中的腐蚀，以满足海洋资源开发过程中海洋工程、船舶工程的需要。Rare earth elements, commonly known as industrial "MSG". Widely used in fine chemical industry, catalyst and other industries. In recent years, the research on the use of rare earth elements in anti-corrosion and corrosion inhibitors has become a hot spot in the research of new corrosion inhibitors. Nevertheless, there is still no report on anticorrosion and corrosion inhibitors for high-strength low-alloy steels in chloride corrosive media. For this reason, the present invention has developed and developed a corrosion inhibitor containing rare earth element 3 valent cerium, which is used to prevent high-strength low-alloy steel from corrosion in chloride-containing corrosive media, so as to meet the needs of marine engineering, needs of ship engineering.
发明内容Contents of the invention
本发明为一种防止高强度低合金钢在氯化物腐蚀介质中腐蚀的缓蚀剂。The invention is a corrosion inhibitor for preventing high-strength low-alloy steel from corroding in chloride corrosion medium.
一种防止高强度低合金钢在含氯化物腐蚀介质中腐蚀的缓蚀剂，其特征在于：A corrosion inhibitor for preventing high-strength low-alloy steel from corroding in a chloride-containing corrosive medium, characterized in that:
缓蚀剂中磷酸盐类浓度范围300～600ppm；磷酸盐中，以三聚磷酸钠含量200～400ppm；磷酸钠含量为100～200ppm；The concentration range of phosphates in the corrosion inhibitor is 300-600ppm; among the phosphates, the content of sodium tripolyphosphate is 200-400ppm; the content of sodium phosphate is 100-200ppm;
亚硝酸钠类化合物浓度为20～60ppm；铈类化合物浓度为30～80ppm；铈类化合物为铈的氯化物、硫酸盐或硝酸盐，且铈的价态为+3价。The concentration of sodium nitrite compound is 20-60ppm; the concentration of cerium compound is 30-80ppm; the cerium compound is cerium chloride, sulfate or nitrate, and the valence state of cerium is +3.
1、加入的聚磷酸盐为三聚磷酸钠，在含氯化物腐蚀介质中钙离子的存在，有利于缓蚀剂效率提高。1. The added polyphosphate is sodium tripolyphosphate, and the presence of calcium ions in the chloride-containing corrosion medium is beneficial to improve the efficiency of the corrosion inhibitor.
2、在上述几种化合物中，加入的亚硝酸钠是氧化剂，有利于促进低合金表面的钝化。三磷酸钠和磷酸钠的添加主要是与含氯化物腐蚀介质中的金属离子，比如低合金钢腐蚀产生的2价铁离子、包括腐蚀介质中的钙离子形成磷酸铁、磷酸钙和聚磷酸铁、钙并沉积在低合金钢表面，起着沉淀型缓蚀膜作用。尽管如此，低合金钢表面的缓蚀膜仍然存在少量的孔隙。在低合金钢表面缓蚀膜的孔隙处是阳极区，发生腐蚀；而缓蚀膜完整区域为阴极区，受到保护。在这种情况下，低合金钢表面构成了典型的大阴极小阳极，加之在氯离子作用下，最终导致低合金钢在含氯化物腐蚀介质中发生严重的孔蚀。2. Among the above compounds, the added sodium nitrite is an oxidizing agent, which is beneficial to promote the passivation of the low-alloy surface. The addition of sodium triphosphate and sodium phosphate is mainly to form iron phosphate, calcium phosphate and iron polyphosphate with metal ions in chloride-containing corrosive media, such as divalent iron ions produced by corrosion of low alloy steel, including calcium ions in corrosive media , calcium and deposited on the surface of low-alloy steel, playing the role of precipitation-type corrosion inhibition film. Nevertheless, there are still a small amount of pores in the corrosion inhibition film on the surface of low alloy steel. The pores of the corrosion-inhibiting film on the surface of low-alloy steel are the anode area, where corrosion occurs; while the complete area of the corrosion-inhibiting film is the cathode area, which is protected. In this case, the surface of low-alloy steel constitutes a typical large cathode and small anode, and under the action of chloride ions, it will eventually lead to severe pitting corrosion of low-alloy steel in chloride-containing corrosive media.
3、众所周知，稀土铈是一种多价态元素，其最高价态为4价。在缓蚀剂中添加中间价态3价铈，起着两个作用，一是3价铈失去电子变成4价铈，起着还原剂作用，而4价铈与腐蚀介质中的氢氧根反应，生成氢氧化物，沉积在低合金钢表面成为缓蚀膜；二是3价铈得到电子变成2价铈，起着氧化剂作用，有利于促进低合金钢表面钝化。同时，2价铈与腐蚀介质中的氢氧根反应，生成氢氧化物，也沉积在低合金钢表面成为缓蚀膜。如前所述，如果不添加铈化合物到缓蚀剂中，低合金钢表面形成的缓蚀膜存在孔隙，并且发生腐蚀反应。在这些活性反应点，是阳极区，电位较负，这样添加的铈化合物中的3价铈就会吸附到这些活性点区域，同时发生氧化和还原反应。最终生成的铈氢氧化物沉积在活性点区域，从而既起到防止点蚀、孔蚀发生的作用，又有利于提高低合金钢表面整体缓蚀膜的加强。所以，3价铈化合物的加入，主要用于抑制低合金钢在含氯化物腐蚀介质中的局部腐蚀，比如点蚀、缝隙腐蚀。同时，也显著地抑制、减轻低合金钢在含氯化物腐蚀介质中的均匀腐蚀。3. As we all know, rare earth cerium is a multivalent element, and its highest valence is 4. The addition of trivalent cerium in the intermediate valence state to the corrosion inhibitor plays two roles. One is that the trivalent cerium loses electrons and becomes tetravalent cerium, which acts as a reducing agent, and the tetravalent cerium interacts with the hydroxide radicals in the corrosion medium. The reaction produces hydroxide, which is deposited on the surface of low-alloy steel to form a corrosion-inhibiting film; the second is that trivalent cerium obtains electrons and becomes divalent cerium, which acts as an oxidant and is beneficial to promote the passivation of the surface of low-alloy steel. At the same time, divalent cerium reacts with hydroxide in the corrosive medium to form hydroxide, which is also deposited on the surface of low-alloy steel to become a corrosion-inhibiting film. As mentioned above, if no cerium compound is added to the corrosion inhibitor, the corrosion inhibition film formed on the surface of low alloy steel has pores and corrosion reaction occurs. These active reaction points are the anode area, and the potential is relatively negative, so that the trivalent cerium in the added cerium compound will be adsorbed to these active point areas, and oxidation and reduction reactions will occur at the same time. The final cerium hydroxide is deposited in the active point area, which not only prevents pitting and pitting corrosion, but also helps to enhance the overall corrosion inhibition film on the surface of low alloy steel. Therefore, the addition of trivalent cerium compounds is mainly used to inhibit local corrosion of low alloy steel in chloride-containing corrosive media, such as pitting corrosion and crevice corrosion. At the same time, it also significantly inhibits and alleviates the uniform corrosion of low alloy steel in chloride-containing corrosive media.
具体实施方式Detailed ways
实例1当缓蚀剂组成为亚硝酸钠类化合物50ppm，磷酸钠化合物200ppm,三氯化铈化合物40ppm，三聚磷酸钠为200ppm时，高强度低合金钢在含氯化物腐蚀介质中的缓蚀率达85％以上。Example 1 When the corrosion inhibitor is composed of sodium nitrite compound 50ppm, sodium phosphate compound 200ppm, cerium trichloride compound 40ppm, and sodium tripolyphosphate is 200ppm, the corrosion inhibition of high-strength low-alloy steel in chloride-containing corrosive medium rate of more than 85%.
实例2当缓蚀剂组成为亚硝酸钠类化合物20ppm，相对降低亚硝酸钠含量；磷酸钠150ppm,三聚磷酸钠含量300ppm；三氯化铈60ppm，高强度低合金钢在含氯化物腐蚀介质中的缓蚀率为85％左右。该配方虽然降低了硝酸盐含量，其毒性降低。但是，通过增加三氯化铈后，高强度低合金钢在氯化物腐蚀介质中的缓蚀率仍然可以达到85％。Example 2 When the corrosion inhibitor is composed of sodium nitrite compound 20ppm, the content of sodium nitrite is relatively reduced; sodium phosphate is 150ppm, the content of sodium tripolyphosphate is 300ppm; The corrosion inhibition rate is about 85%. Although the formula has reduced nitrate content, its toxicity is reduced. However, after adding cerium trichloride, the corrosion inhibition rate of high-strength low-alloy steel in chloride corrosion medium can still reach 85%.
实例3当缓蚀剂组成为亚硝酸钠化合物20ppm，磷酸钠100ppm,三聚磷酸钠化合物250ppm，三氯化铈盐60ppm时，高强度低合金钢在氯化物腐蚀介质中的缓蚀率达95％左右。该配方磷酸钠、三聚磷酸钠含量降低.同时，保持三氯化铈含量不变，更有效地抑制了腐蚀。Example 3 When the corrosion inhibitor is composed of sodium nitrite compound 20ppm, sodium phosphate 100ppm, sodium tripolyphosphate compound 250ppm, and cerium trichloride salt 60ppm, the corrosion inhibition rate of high-strength low-alloy steel in chloride corrosion medium reaches 95 %about. The content of sodium phosphate and sodium tripolyphosphate in this formula is reduced. At the same time, the content of cerium trichloride is kept unchanged, which more effectively inhibits corrosion.
实例4当缓蚀剂组成为亚硝酸钠20ppm，磷酸钠100ppm,三聚磷酸钠300ppm，三氯化铈40ppm时，高强度低合金钢在含氯化物腐蚀介质中的缓蚀率仍然达95％。肉眼观察，试样表面被一层灰色膜覆盖。采用显微镜观察，低合金钢表面是一层网状膜。经过EDX分析，缓蚀膜中主要含有铈元素。去掉表面缓蚀膜，低合金钢试样表面没有腐蚀、点蚀迹象。该配方在确保硝酸盐含量最低的同时，进一步减少了三氯化铈的加入，只是增加了三聚磷酸盐化合物含量，取得了很好效果。由此，构成了一种含3价铈的用于防止高强度低合金钢在氯化物腐蚀介质中腐蚀的高效经济缓蚀剂。Example 4 When the corrosion inhibitor is composed of sodium nitrite 20ppm, sodium phosphate 100ppm, sodium tripolyphosphate 300ppm, and cerium trichloride 40ppm, the corrosion inhibition rate of high-strength low-alloy steel in the chloride-containing corrosive medium still reaches 95%. . Visually, the surface of the sample was covered by a layer of gray film. Using a microscope, the surface of the low-alloy steel is a layer of reticular film. After EDX analysis, the corrosion inhibition film mainly contains cerium element. The surface corrosion inhibition film was removed, and the surface of the low-alloy steel sample showed no signs of corrosion or pitting. While ensuring the lowest nitrate content, the formula further reduces the addition of cerium trichloride and only increases the content of tripolyphosphate compounds, which has achieved good results. Thus, a high-efficiency and economical corrosion inhibitor containing trivalent cerium for preventing corrosion of high-strength low-alloy steel in chloride corrosion medium is constituted.
实例5当缓蚀剂组成为亚硝酸钠20ppm，磷酸钠100ppm,三聚磷酸钠300ppm，三氯化铈40ppm，取消钼酸钠类化合物时，高强度低合金钢在含天然海水中的缓蚀率达95％以上，略高于在配制的氯化物介质中的缓蚀率。采用显微镜观察低合金钢表面，其表面同样被一层带白点灰色膜覆盖，经过EDX分析，缓蚀膜中主要含有铈元素，钙、镁元素等。去掉缓蚀膜，也未见点蚀、孔蚀痕迹。说明天然海水中的钙镁离子，有利于提高缓蚀剂效率。表明构成的含3价铈的高效缓蚀剂可以用于防止高强度低合金钢在海水中的腐蚀。Example 5 When the corrosion inhibitor is composed of sodium nitrite 20ppm, sodium phosphate 100ppm, sodium tripolyphosphate 300ppm, cerium trichloride 40ppm, and when sodium molybdate compounds are canceled, the corrosion inhibition of high-strength low-alloy steel in natural seawater The rate is more than 95%, which is slightly higher than the corrosion inhibition rate in the prepared chloride medium. Using a microscope to observe the surface of low-alloy steel, the surface is also covered by a layer of gray film with white spots. After EDX analysis, the corrosion inhibition film mainly contains cerium, calcium, and magnesium elements. Remove the corrosion inhibition film, and no traces of pitting and pitting corrosion were seen. It shows that calcium and magnesium ions in natural seawater are beneficial to improve the efficiency of corrosion inhibitors. It shows that the high-efficiency corrosion inhibitor containing trivalent cerium can be used to prevent the corrosion of high-strength low-alloy steel in seawater.
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