ASTM G28-02(2015)

1.1 These test methods cover two tests as follows:

1.1.1 Method A, Ferric Sulfate-Sulfuric Acid Test (Sections 3 - 10, inclusive)-This test method describes the procedure for conducting the boiling ferric sulfate-50 % sulfuric acid test which measures the susceptibility of certain nickel-rich, chromium-bearing alloys to intergranular corrosion (see Terminology G15), which may be encountered in certain service environments. The uniform corrosion rate obtained by this test method, which is a function of minor variations in alloy composition, may easily mask the intergranular corrosion components of the overall corrosion rate on alloys N10276, N06022, N06059, and N06455.