Corrosion Test Standard Selection

Corrosion resistance is an important characteristic of Ni – base alloys and weldments. There are many acceptance tests specified in ASTM or EN ISO and other literature to evaluate the corrosion resistance of alloys for use in different environments.

In this article, for common requirement in project specification. Intergranular corrosion, pitting, crevice or general corrosion assessment that will be took into discussion.

I will try to describe the differences of the tests for applicable common standards (ASTM/ISO) and point out which alloys the tests are intended for, and recommends the most appropriate test when none is specified.

ASTM 262, G28, G48, SEP 1877

The Huey test (A262 method C) is used for:

Material: only for molybdenum-free grades (e.g 304L).

Environment: High oxidizing solution (acid nitric, sulfuric, chloric, fuel gas, ozone ect.,) in Petrochemical, Refinery, Waste-treatment plant.

Purpose: Assurance of Correct heat-treatment, Effective of stabilizing element (Ti-Nb) on detecting chromium depleted regions as well as intermetallic precipitations, like sigma phase, in the material.

The Streicher Test ASTM A262 method B (Same with G28A, ISO 3651 – Method C) is used for:

This test is based on weight loss determinations and provides a quantitative measure of the relative performance of the material evaluated

Material: for Sensitized Material (Heated by Treatment or Weld), Series 300 Stainless steel, Cr-Ni-Mo Stainless steel (Eg. 2205, 2507, 904L)

Environment: High oxidizing solution (acid nitric, sulfuric, chloric, fuel gas, ozone ect.,) in Petrochemical, Refinery, Waste-treatment plant.

Purpose: Checking Effective of stabilizing element (Mo) on protecting inter granular attack associated with the precipitation of chromium carbides at grain boundaries,

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