ISO 4212:2023 PDF

Scope: This document specifies a method to test for intergranular corrosion (IGC) in austenitic stainless steels using an oxalic acid etch. This method can evaluate non-sensitization of austenitic stainless steels by observing the structure of the etched surface with a microscope after performing electrolytic etching (hereinafter called “etching”) on austenitic stainless steel in an oxalic acid solution.

ISO 4212:2023 Referenced Document

ISO 12732 Corrosion of metals and alloys - Electrochemical potentiokinetic reactivation measurement using the double loop method (based on Cihal's method)
ISO 3651-1 Determination of resistance to intergranular corrosion of stainless steels - Part 1: Austenitic and ferritic-austenitic (duplex) stainless steels - Corrosion test in nitric acid medium by measurement of loss in mass (Huey test)
ISO 3651-2 Determination of resistance to intergranular corrosion of stainless steels - Part 2: Ferritic, austenitic and ferritic-austenitic (duplex) stainless steels - Corrosion test in media containing sulfuric acid
ISO 3696:1987 Water for analytical laboratory use; Specification and test methods
ISO 8044 Corrosion of metals and alloys — Vocabulary

2023 ISO 4212:2023 Corrosion of metals and alloys — Method of oxalic acid etching test for intergranular corrosion of austenitic stainless steel