Alternate Immersion Corrosion Testing


Caltech Engineering Services, Mumbai India offers Alternate Immersion Corrosion Testing for aluminum alloys as per ASTM G47 & ASTM G44 Method.

This Corrosion test is recommended for ISO 7866 – Gas cylinders – Refillable seamless aluminium alloy gas cylinders.

This test method both ASTM G44 & ASTM G47 covers a uniform procedure for characterizing the resistance to stress-corrosion cracking (SCC) of high-strength aluminum alloy wrought products for the guidance of those who perform stress-corrosion tests using alternate immersion corrosion method.

ASTM G44 & ASTM G47 test method is suitable for those who prepare alternate immersion corrosion testing stress-corrosion specifications, and for materials engineers especially when material is stressed in the short-transverse direction relative to the grain structure. Test period is 40 days. The test requires alternate immersion test utilizes a 1-h cycle that includes a 10-min period in an aqueous solution of 3.5 % sodium chloride (NaCl) followed by a 50-min period out of the solution, during which the specimens are allowed to dry along with Tension Specimens Device—Stress tension specimens in “Constant Strain”-type fixtures, as in Fig. 3 of Practice G 49 i.e Stress Corrosion proof rings at ambient temperature. In this test method normally 3.5 % NaCl solution alternate immersion test provides a test environment for detecting materials that would be likely to be susceptible to SCC in natural outdoor environments, especially environments with marine influences. For determining actual serviceability of a material, other stress-corrosion tests should be performed in the intended service environment under conditions relating to the end use, including protective measures.

Although this test method is intended for certain alloy types and for testing products primarily in the short-transverse stressing direction, this method is useful for some other types of alloys and stressing directions.

ASTM G38 Practice for Making and Using C-Ring Stress-Corrosion Test Specimens

ASTM G44 Practice for Exposure of Metals and Alloys by Alternate Immersion in Neutral 3.5 % Sodium Chloride Solution

ASTM G47 Standard Test Method for Determining Susceptibility to Stress-Corrosion Cracking of 2XXX and 7XXX Aluminum Alloy Products

ASTM G49 Practice for Preparation and Use of Direct Tension Stress-Corrosion Test Specimens

ASTM G139 Test Method for Determining Stress-Corrosion Cracking Resistance of Heat-Treatable Aluminum Alloy Products Using Breaking Load Method

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