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Passivation Testing

We have passivated SS-316L parts based on the SAE format -AMSQQP35 [canceled] (Type VI). For testing the passivation, it has been suggested SALT SPRAY TEST, copper sulphate [on eBay or Amazon]TEST, HUMIDITY TEST & Water immersion test. What type of Salt Spray test should we perform on this passivation and for what duration?

Dear Mr Sharat,

You may suggest a neutral Salt Spray test for 48 hours, as per procedure specified in IS 9844 or ASTM B117.

You wrote:We have passivated SS-316L parts based on the SAE format AMSQQP35 (Type VI). For testing the passivation, it has been suggested SALT SPRAY TEST, copper sulphate TEST, HUMIDITY TEST & Water immersion test. What type of Salt Spray test should we perform on this passivation and for what duration?

Par. 4.4.1 of AMSQQP35 specifies that either a water immersion test or a high humidity test be performed to verify effectiveness of passivate process. You must perform this test to be in compliance with the specification unless:

Procuring activity allows either a copper sulphate test per Par. 4.4.2.2 of AMSQQP35 or a salt spray test per Par. 4.4.2.1 of AMSQQP35. The copper sulphate test is the easiest to perform. When salt spray test is performed AMSQQP35 states that it shall be in accordance with ASTM B117 and performed for a minimum of 2 hours using a 5% salt solution.

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