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Intergranular Corrosion (IGC) Testing

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  • Intergranular Corrosion (IGC) Testing

    Intergranular corrosion (IGC), also known as intergranular attack (IGA), is a common local corrosion. Corrosion develops along the crystal grains boundary or its adjacent area of a metal or alloy, and the corrosion of the grain itself is very slight. This corrosion greatly weakens the bonding force between the crystal grains, and in severe cases, the mechanical strength can completely disappear. Stainless steel, nickel-based alloy, aluminum alloy and magnesium alloy are all materials with high sensitivity to intergranular corrosion. In the case of heating, the welding process will cause the problem of intergranular corrosion. Intergranular corrosion (IGC) is an effective test to screen the corrosion resistance of materials under certain conditions. T,C&A Lab's dedicated experts have professional corrosion testing capabilities to help you choose the most appropriate solution to evaluate the intergranular corrosion resistance of your materials and guide the thermomechanical and welding processes.

    Our intergranular corrosion test methods include but are not limited to:

    • Copper - Copper Sulfate - Sulfuric Acid Method

    It is suitable for testing the intergranular corrosion caused by carbon and nitride precipitation in almost all types of stainless steel and some nickel-based alloys.

    • Nitric Acid Method

    It is suitable for testing the intergranular corrosion caused by carbide, σ phase precipitation or solute segregation in stainless steel, Ni-based alloy and so on.

    • Nitric Acid - Hydrofluoric Acid Method

    It is suitable for testing the intergranular corrosion of molybdenum-containing austenitic stainless steel caused by carbide precipitation.

    • Sulfuric Acid - Iron Sulfate Method

    It is suitable for testing the intergranular corrosion of Ni-based alloy and stainless steel caused by carbide precipitation.

    • Oxalic Acid Etching Test Method

    It is mainly used as a screening test for testing the intercrystalline corrosion of austenitic stainless steel.

    • Hydrochloric Acid Method

    It is suitable for testing the intergranular corrosion of some high molybdenum nickel base alloys.

    • Sodium Chloride - Hydrogen Peroxide Method

    It is suitable for testing the intergranular corrosion of copper-containing alloys.

    • Sodium Chloride - Hydrochloric Acid Method

    It is suitable for testing the intergranular corrosion of magnesium aluminum alloy.

    • Electrochemical Potentiokinetic Reactivation (EPR)

    It is suitable for measuring the intergranular corrosion sensitivity of stainless steel clad plates and low chromium ferritic stainless steel

    Standards we test to

    ASTM A262Standard Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels
    ASTM A763Standard Practices for Detecting Susceptibility to Intergranular Attack in Ferritic Stainless Steels
    ASTM G28Detecting Susceptibility to Intergranular Corrosion in Wrought, Nickel-Rich, Chromium-Bearing Alloys
    ASTM G67Standard Test Method for Determining the Susceptibility to Intergranular Corrosion of 5XXX Series Aluminum Alloys by Mass Loss After Exposure to Nitric Acid (NAMLT Test)
    ASTM G108Standard Test Method for Electrochemical Reactivation (EPR) for Detecting Sensitization of AISI Type 304 and 304L Stainless Steels
    ASTM G110Evaluating Intergranular Corrosion Resistance of Heat Treatable Aluminum Alloys by Immersion in Sodium Chloride + Hydrogen Peroxide Solution
    ASTM G123Evaluating Stress-Corrosion Cracking of Stainless Alloys with Different Nickel Content in Boiling Acidified Sodium Chloride Solution
    ISO/CD 4212Method of Oxalic Acid Etching Test for Intergranular Corrosion of Austenitic Stainless Steel

    In addition, the experts in our Intergranular Corrosion (IGC) Testing Laboratory also provide a variety of custom tests as you need. Let's discuss the customized service with our experts for free.

    Instruments and data

    Pitting Corrosion Testing
    Pitting Corrosion Testing
    Pitting Corrosion Testing
    Pitting Corrosion Testing

    References

    1. Sun; et al. Investigation of susceptibility to intergranular corrosion of tin-added austenitic stainless steel. Acta Metallurgica Sinica (English Letters). 2015, 28(9), 1183-1189.
    2. Liu, G.; et al. The Intergranular Corrosion Susceptibility of Metastable Austenitic Cr–Mn–Ni–N–Cu High-Strength Stainless Steel under Various Heat Treatments. Materials. 2019, 12(9), 1385.
    3. Cheng; et al. Intergranular corrosion behavior and mechanism of the stabilized ultra-pure 430LX ferritic stainless steel. Journal of Materials Science & Technology. 2019, 35(8), 1787-1796.

    Note: this service is for Research Use Only and Not intended for clinical use.

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    T,C& A LAB is an independent lab providing quality or custom testing, characterization and analysis of a variety of materials. Our engaged experts are ready to help you.

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