Detecting Susceptibility to Intergranular Corrosion in Wrought, Nickel-Rich, & Chromium-Bearing Alloys


This is a test for detecting susceptibility to intergranular attack on most nickel base alloys. There are two methods covered by this specification.


  • Method A- Ferric Sulfate-Sulfuric Acid Test
  • Method B, Mixed Acid-Oxidizing Salt Test


METHOD A—Ferric Sulfate—Sulfuric Acid Test is applied to the following alloys in the wrought condition:

Alloy UNS#       Time, h
N06007         120
N06022          24
N06030        120
N06059          24
N06200          24
N06455          24
N06600          24
N06625        120
N06686          24
N06985        120
N08020        120
N08367          24
N08800        120
N08825A      120
N10276          24