GB1405414A - Detection of surface films - Google Patents
Detection of surface filmsInfo
- Publication number
- GB1405414A GB1405414A GB5082571A GB5082571A GB1405414A GB 1405414 A GB1405414 A GB 1405414A GB 5082571 A GB5082571 A GB 5082571A GB 5082571 A GB5082571 A GB 5082571A GB 1405414 A GB1405414 A GB 1405414A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cell
- reducible
- electrode
- metal surface
- current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000001514 detection method Methods 0.000 title 1
- 239000002184 metal Substances 0.000 abstract 3
- 229910001220 stainless steel Inorganic materials 0.000 abstract 2
- 239000010935 stainless steel Substances 0.000 abstract 2
- 238000000840 electrochemical analysis Methods 0.000 abstract 1
- 239000003792 electrolyte Substances 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/416—Systems
- G01N27/49—Systems involving the determination of the current at a single specific value, or small range of values, of applied voltage for producing selective measurement of one or more particular ionic species
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Molecular Biology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
1405414 Electro-chemical analysis WILKINSON SWORD Ltd 9 Oct 1972 [2 Nov 1971] 50825/71 Heading G1N Reducible and non-reducible passivating films on a metal surface, e.g. razor blades, are distinguished by making the metal surface 6 one electrode of an electrolytic cell 5 whose other, stainless steel, electrode 8 is electrolytically inert in the cell, applying a potential difference between the electrodes so that the metal surface 6 is negative and measuring the energy capacity of the cell. In the arrangement shown the potential difference from supply 12 is applied to the cell 5 and after a predetermined time e.g. 1.3 seconds timing circuit 20 switches current recorder 26 into the circuit to measure the current flowing. This current is much greater if a reducible passivating film is present than if a non-reducible passivating film is present, Fig. 2 (not shown). In an alternative arrangement Fig. 3 (not shown), the recorder 26 is replaced by a coulometer which measures the electrical charge flowing through the cell for a predetermined time e.g. 15 seconds beginning when the P.D. is applied. The number of coulombs is indicative of the reducibility content of the film. The electrode 8 is stainless steel and the electrolyte 59.8% H 3 PO 4 , 14.9% H 2 SO 4 , 0.8% CrO 3 and the remainder water.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5082571A GB1405414A (en) | 1971-11-02 | 1971-11-02 | Detection of surface films |
| DE19722252486 DE2252486A1 (en) | 1971-11-02 | 1972-10-26 | METHOD AND A DEVICE FOR CHECKING A METAL SURFACE FOR THE PRESENCE OF A CORROSION PROTECTION LAYER |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5082571A GB1405414A (en) | 1971-11-02 | 1971-11-02 | Detection of surface films |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1405414A true GB1405414A (en) | 1975-09-10 |
Family
ID=10457527
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5082571A Expired GB1405414A (en) | 1971-11-02 | 1971-11-02 | Detection of surface films |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE2252486A1 (en) |
| GB (1) | GB1405414A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4495558A (en) * | 1982-06-25 | 1985-01-22 | General Electric Company | Method and apparatus for determining oxide film thickness |
| WO2006065623A1 (en) * | 2004-12-16 | 2006-06-22 | The Gillette Company | Crack detection in razor blades |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55149049A (en) * | 1979-05-10 | 1980-11-20 | Nippon Paint Co Ltd | Testing method for corrosion evaluation of coated metal material and its apparatus |
-
1971
- 1971-11-02 GB GB5082571A patent/GB1405414A/en not_active Expired
-
1972
- 1972-10-26 DE DE19722252486 patent/DE2252486A1/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4495558A (en) * | 1982-06-25 | 1985-01-22 | General Electric Company | Method and apparatus for determining oxide film thickness |
| WO2006065623A1 (en) * | 2004-12-16 | 2006-06-22 | The Gillette Company | Crack detection in razor blades |
| US7214941B2 (en) | 2004-12-16 | 2007-05-08 | The Gillette Company | Crack detection in razor blades |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2252486A1 (en) | 1973-05-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |