ISO 4212:2023
Corrosion of metals and alloys — Method of oxalic acid etching test for intergranular corrosion of austenitic stainless steel
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.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 General principles
5 Apparatus
6 Sensitization heat treatment for test specimens
7 Test specimens
8 Test solution
9 Test procedure
10 Evaluation of etching structure
11 Test report
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 General principles
5 Apparatus
6 Sensitization heat treatment for test specimens
7 Test specimens
8 Test solution
9 Test procedure
10 Evaluation of etching structure
11 Test report
Bibliography