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Corrosion Testing Services

Salt Spray ASTM B117

Approved by Lockheed Martin

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Salt Spray Testing is governed by the latest revision of ASTM-B-117. Salt Spray is also known as Salt Fog Testing. There are numerous applications that would require the testing and certification with the use of Salt Spray Testing. Test Metals is ISO/IEC 17025:2017 Accredited for this service.

ASTM G48
ASTM A262 

ASTM A262 is the specification which governs five practices used to determine if the Austenitic structure is susceptible to intergranular attack (IGA). This is not for determining resistance to Stress Corrosion Cracking (SCC) which is a transgranular attack. There is several cause for SCC, Chloride is the leading cause of transgranular cracking or attack.  This specification is for detecting susceptibility to intergranular attack (IGA). Intergranular corrosion is the proper use, though the specification calls it attack, corrosion is what is taking place. Intergranular simply means that the corrosion is taking place between the grains or crystals, which is where sigma phase or chromium carbides are going to form which makes the material susceptible to IGA. All austenitic stainless steels should meet this requirement, if proper annealing took place.

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ASTM G48 procedures are for determination of the resistance of stainless steels and nickel related alloys to pitting and crevice corrosion when exposed to oxidizing chloride environments.

 

Test Metals can provide all six procedures which are described and identified as Methods A, B, C, D, E, and F. 

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  • Method A—Ferric chloride pitting test.

  • Method B—Ferric chloride crevice test.

  • Method C—Critical pitting temperature test for nickel-base and chromium-bearing alloys.

  • Method D—Critical crevice temperature test for nickel-base and chromium-bearing alloys.

  • Method E—Critical pitting temperature test for stainless steels.

  • Method F—Critical crevice temperature test for stainless steels.

ASTM G28
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This is a test for detecting susceptibility to intergranular attack on most nickel base alloys. There are two methods covered by this specification.

 

  • Method A- Ferric Sulfate-Sulfuric Acid Test

  • Method B, Mixed Acid-Oxidizing Salt Test

 

ASTM A923 Method C
ASTM A967

Passivation Screen for Stainless Steel is preformed in accordance with ASTM-A-967. There is additional supporting specification like FED QQ P 35 of which most reference the ASTM governing specification or at least follow the same basics for screening.

  • Practice A - Water Immersion Test

  • Practice B- High Humidity Test

  • Practice C - Salt Spray Test

  • Practice D- Copper Sulfate Test

  • Practice E - Potassium Ferricyanide-Nitric Acid Test

  • Practice F- Free Iron Test

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ASTM A923 Method C is a corrosion test that is similar to G48. This test has been modified specifically for duplex stainless steels and is used to detect detrimental intermetallic phase in the duplex austenitic/ferritic structure. This specification covers three testing methods for evaluating the material. CMS can perform all three of the test methods.

  • Test method A - Sodium Hydroxide Etch Test 

  • Test method B - Charpy Impact Test 

  • Test method C - Ferric Chloride Corrosion Test

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