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topic 4192

Salt Spray or Humidity Test for Passivated Stainless Steel?

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We have been puzzled what test should be performed to compare a non-passivated and a passivated 420 stainless steel component in order to tell the difference in corrosion resistance.

We are afraid that salt spray will be too severe whereas humidity will take a long long time.

Any comment is welcome. Thanks in advance.

Kwok-wai Chook
- Hong Kong, China


Mr Chook

You can test with either test. Per ASTM A967 [link by ed. to spec at TechStreet] 99, 2hr salt spray or 24 hour humidity. They should exhibit no sign of corrosion.

Kevin Almquist
- Danielson, Connecticut


Mr Chook, We are currently using this process for 300 series and PH17 series stainless steel with no problems. We are using 5% salt solution and have collections of 1.3 to 1.7mls per hour.

steve adams
- cedar city ut usa

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