ASTM G48 is a standard test method that measures the resistance of austenitic stainless steel to pitting corrosion. The test method is used to evaluate the pitting corrosion resistance of materials in environments containing chloride ions.
The ASTM G48 test involves exposing a sample of the material to a solution of ferric chloride (FeCl3) at a certain temperature for a specific duration. The test method involves the use of a cylindrical specimen holder that is filled with the test solution and then placed in a heated vessel. The temperature and duration of exposure are determined by the material being tested and the intended application.
After the test period, the specimen is removed from the test solution, cleaned, and then examined for signs of pitting corrosion. The degree of pitting is typically evaluated using a visual rating system that measures the depth and density of the pits on the surface of the material.
The ASTM G48 test is commonly used in the petrochemical, chemical, and marine industries to evaluate the suitability of materials for use in harsh environments containing chloride ions. The test provides a quantitative measurement of a material’s resistance to pitting corrosion, which can help to inform material selection and design decisions