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ASTM G28 A - Detecting Susceptibility to Intergranular Corrosion 

 

MATERIAL:  NICKEL-CLAD

WELDING MATERIAL:  ALLOY 868 

 

TEST PROCEDURE 

Three samples were provided for testing.  The flat surfaces were then ground to a 120-grit finish and the welds were glass bead blasted to remove the scale. The test ran for 24 hours. All other test procedures were in accordance with ASTM G28: “Standard Test Methods for Detecting Susceptibility to Intergranular Corrosion in Wrought, Nickel-Rich, Chromium-Bearing Alloys, Method A, Ferric Sulfate-Sulfuric Acid Test”. 

 

RESULTS 

After testing, the specimens were cleaned, re-weighed, and examined.  The mass loss was used to determine the corrosion rate (see Table 1 below) for each of the specimens. Corrosion rates generally accepted for this material in this test are less than 0.04 inches per month. The corrosion rates for all three tested samples were below this criteria. 

 

TABLE 1

ASTM G28 A Corrosion Rates

Sample

Corrosion Rate

#

Description

(inches per month)

1

Open butt weld

0.0051

2

Butt weld with backing

0.0061

3

Corner fillet weld

0.0036

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