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NACE MR0175 and surface treatments to prevent SSC

Question: ANSI/NACE MR0175/ISO 15156-2, Section A.2.1.5, Surface Treatments, Overlays, Plating, Coatings, Linings, etc. This section states that metallic coatings, such as electroless nickel plating, are not acceptable for preventing SSC. It was my understanding that the qualification of a plated part was dependent on the base metal. If the base metal is in conformance with MR0175 then the part can be qualified regardless of what plating or coating may be applied. Is my understanding correct?

Answer:

The application and use of metallic plating that does not affect the ISO 15156 compliant base material is not prohibited. No metallic platings are listed as acceptable or unacceptable in ISO 15156 but the use of any surface treatments to prevent SSC is not acceptable.

This question is in relation to NACE MR0175/ISO 15156-2 Annex A.2.1.5

Reference: ISO 15156 Maintenance Panel Inquiry #2011-13

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