Can Metallic Coatings Prevent SSC in Accordance with ANSI/NACE MR0175/ISO 15156-2?

Introduction

This page addresses a common question regarding the acceptance of metallic coatings, such as electroless nickel plating, for preventing SSC in accordance with ANSI/NACE MR0175/ISO 15156-2, Section A.2.1.5, Surface Treatments, Overlays, Plating, Coatings, Linings, etc.

Background

The question asks if the qualification of a plated part is dependent on the base metal and if a plated part can be qualified if the base metal is in conformance with MR0175.

The Answer

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

Reference

The page cites ISO 15156 Maintenance Panel Inquiry #2011-13 as a reference for this question.

Conclusion

In conclusion, while metallic coatings cannot be used to prevent SSC in accordance with ANSI/NACE MR0175/ISO 15156-2, the application and use of metallic plating that does not affect the ISO 15156 compliant base material is not prohibited.