Standard Practice for Immersion Testing of Industrial Protective Coatings and Linings

Abstract

4.1 Protective coatings are used on metallic and concrete storage and processing vessels, shipping containers, dams and rail cars to protect the substrate from corrosive attack and to protect stored materials (cargo) from contamination. This method provides a means to assess the ability of a protective coating to resist degradation by chemicals and to protect the liquid cargo from contamination by either the substrate or coating, based on visual observations. Other measures of degradation, such as changes in weight or dimensions of the coating material, or chemical changes to the cargo, may be used to assess this protective ability as mutually agreed upon between contracting parties. Simple chemical-resistance evaluations of the lining materials may be performed more conveniently by other pertinent methods as a prescreening test for this procedure in accordance with Test Methods C267 and D471. 4.2 This practice covers three approaches to conducting evaluations of a lining coating material’s fitness for purpose. 4.2.1 Method A—Evaluation of specimens under conditions of constant temperature at atmospheric pressure (that is, without a thermal gradient). 4.2.2 Method B—Evaluation of specimens under conditions which provide a temperature gradient across the sample. 4.2.3 Method C—Evaluation of specimens under conditions of constant temperature and increased pressure (that is, without a thermal gradient).