ASTM B940 is the Standard Practice for Testing Non-Chromate Coatings on Zinc and Cadmium Surfaces, providing a focused technical framework for evaluating how these coatings perform on plated metal finishes. It is used to support consistent testing and more reliable product comparison when non-chromate alternatives are specified for corrosion protection or surface treatment. By defining a common practice, ASTM B940 helps buyers, suppliers, and laboratories align expectations around coating performance and quality control.

ASTM B940 standard overview

The ASTM B940 standard addresses testing methods for non-chromate coatings applied to zinc and cadmium surfaces. Its purpose is to support evaluation of coating behavior on these specific substrates, making it easier to assess whether a finish meets intended performance requirements. As an ASTM standard, it is most useful where coating selection, specification review, and test consistency matter. It provides a technical reference for comparing results and supporting compliance-focused decisions in coating applications.

Where is ASTM B940 used?

ASTM B940 is commonly used in environments where zinc- or cadmium-coated parts receive non-chromate surface treatments and must be tested in a consistent way. This can include production, incoming inspection, laboratory evaluation, and supplier qualification workflows. It is relevant to organizations that work with plated components and need a clear practice for testing coating performance on these surfaces. The standard helps keep testing aligned across manufacturing and procurement steps.

Practical importance of ASTM B940

The practical value of ASTM B940 lies in helping reduce ambiguity when evaluating non-chromate coatings on zinc and cadmium surfaces. A shared testing practice can improve consistency between suppliers, labs, and end users, which supports better product comparison and quality control. It may also help organizations document compliance expectations and manage coating-related risk more effectively. For procurement and engineering teams, this creates a clearer basis for reviewing surface treatment performance.

• Testing practice for coated zinc and cadmium surfaces
• Non-chromate coating evaluation reference
• Supports consistent quality control decisions
• Useful for supplier and product comparison