Water Resistance Test


Corrosion occurs when metals are exposed to oxygen and form undesirable byproducts, effectively reducing the metal's lifespan. With water being such a commonly found and naturally occurring substance, it also serves as one of the most common causes of metal corrosion. Surface coatings can easily prevent metal corrosion, provided they can keep it away from the metal substrate it protects. ASTM D870 measures a coating's ability to prevent water from coming into contact with its substrate, effectively preventing corrosion from beginning. The coated surfaces are totally or partially immersed in distilled or deionized water in a corrosion-resistant container at a specific temperature for a certain amount of time. Test panels are subsequently evaluated for blistering, softening, loss of adhesion, or any other coating defect.

Standardized water resistance immersion testing

ASTM Specifications

ASTM Title
Standard Practice for Testing Water Resistance of Coatings Using Water Immersion
This practice covers the basic principles and operating procedures for testing water resistance of coatings by the partial or complete immersion of coated specimens in distilled or de-mineralized water at ambient or elevated temperatures. Although the apparatus and procedure could be employed in immersion tests using solutions of various materials in water, this practice is limited to tests in water alone.

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