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  • BSI
    21/30412498 DC BS ISO 4212. Corrosion of Metals and Alloys. Method of oxalic acid etching test for intergranular corrosion of austenitic stainless steel
    Edition: 2021
    $44.66
    / user per year

Description of 21/30412498 DC 2021

This document describes a method to test for 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. This method can evaluate suspicions of sensitization of austenitic stainless steels, because it does not etch chromium depletion adjacent to the chromium-rich grain boundary precipitates but chromium-rich grain boundary carbides themselves. If sensitization is suspected, the ferric sulfate-sulfuric acid test ( ISO3651-2 ), 65 % nitric acid test ( ISO3651-1 ), copper sulfate-sulfuric acid test ( ISO3651-2 ), or EPR test ( ISO12732 ) should be conducted to evaluate sensitization of austenitic stainless steels.



Standard Number21/30412498 DC
TitleBS ISO 4212. Corrosion of Metals and Alloys. Method of oxalic acid etching test for intergranular corrosion of austenitic stainless steel
StatusDefinitive
Publication Date2021-10-11
Identical National Standard OfISO/DIS 4212
DescriptorsCorrosion, Metals, Alloys, Oxalic acid, Etching, Chemical reactions, Intergranular corrosion, Stainless steels
ICS77.060 Corrosion of metals
CommitteeISENFE/8
PublisherBSI
Pages14

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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