Alternate Immersion Stress Corrosion Cracking Test Instruments

Caltech Instruments Pvt Ltd offers instruments for Alternate Immersion Stress-Corrosion Cracking (SCC) Corrosion Test recommended for aluminium alloys as per ASTM G47 & ASTM G44 Method. ASTM G47 helps in selecting appropriate aluminum alloys for applications where SCC is a concern, such as in aerospace, automotive, marine and defense industries.

This Corrosion test is also recommended for ISO 7866 – Gas cylinders – material for 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. The test provides insights into the influence of various factors like heat treatments and alloy composition on SCC susceptibility

ASTM G44 & ASTM G47 test method is suitable for those who need to test alternate immersion Stress-Corrosion Cracking (SCC) testing as per specifications, and for materials engineers especially when material is stressed in the short-transverse direction relative to the grain structure. Typical test durations range from 10 to 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 specimen’s 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 G47 testing
• Alternate Immersion ASTM G47 test apparatus
• Stress-Corrosion Cracking of Aluminum Alloy Products
• SCC in natural outdoor environments ASTM G47 corrosion standards
• 3.5 % NaCl solution alternate immersion test
• Testing instrument for ASTM G47
• Laboratory corrosion testing tools
• Stress Corrosion Cracking of Aluminium Alloy products by alternate immersion test
• Ensure precise and reliable corrosion testing with our advanced ASTM G47 Testing Instruments, designed specifically to evaluate the Stress Corrosion Cracking of Aluminium Alloy products by alternate immersion test

Our instruments complies with the strict protocols of ASTM G47 – Standard Test Method for Determining Susceptibility to Stress-Corrosion Cracking of Aluminum Alloy Products. ASTM G47 test solution provides a test environment for detecting materials that would be likely to be susceptible to SCC in natural outdoor environments, especially environments with marine influence. This test can be useful for other alloys also

This test method provides a comprehensive procedure prepare stress-corrosion specifications, and for materials engineers to perform accelerated stress-corrosion testing.

Key Features:

✅ Compliant with ASTM G47 specifications
✅ High-accuracy temperature control and acid solution monitoring
✅ Durable corrosion-resistant components
✅ Easy-to-operate interface for lab and industrial use
✅ Suitable for various aluminium grades and heat treatments

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 of2XXX 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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