Abstract. A detailed study of AISI and stainless steels (SSs) has been conducted to correlate the degree of sensitization (DOS) measured by the. ASTM a Test, Intergranular Corrosion, IGC, ASTM A Practice, Copper – Copper Sulfate – 16% sulfuric acid, ASTM A – Practice E (Strauss Test). ASTM A Practice E test. This practice describes the procedure by which the copper-copper sulfate% sulfuric acid test is conducted to determine .

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Discover perspectives, resources, and advice from our world-leading Engaged Experts. A different ASTM A test method must be used to quantify the level of corrosion or to disqualify a material for use. Specimen surface before soaking in boiling Ferric Sulfate-Sulfuric Acid solution.

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Intergranular cracking or crazing is evidence of susceptibility. Sensitization causes the grain boundaries of a material to precipitate, creating carbide deposits and causing q262 material to be susceptible to intergranular attack. Work Item s – proposed revisions of this standard.

The Huey test works well to analyze chromium depleted regions and intermetallic precipitates, such as sigma phase, and is also used for materials in strongly oxidizing environments such as nitric acid. From macroscopic imaging to Scanning Electron Microscopy, Element provides turnkey metallographic services using state-of-the-art equipment.

The bent samples are examined at low magnification, where the appearance of cracks or fissures indicate intergranular attack. This simple etching technique is used as a quick screening method to ensure that a material is free of intergranular corrosion susceptibility.


Contact us now for pricing or a quote! Corrosion is measured by a weight loss that is converted to a corrosion rate. These tests do not provide a basis for predicting resistance to forms of corrosion other than intergranular, such as general corrosion, pitting, or stress-corrosion cracking. Similar to the Streicher test, the Huey test method uses a nitric acid solution and subjects the specimen to five hour boiling intervals.

The chart below comes from the ASTM A standard for selection of the appropriate test by alloy type:. Please share this page: What is your typical turnaround time? Historical Version s – view previous versions of standard. Since high temperature processing such as heat treatment is a common practice, many manufacturers wish to perform intergranular corrosion qualification testing on each batch, to ensure that the material has been processed correctly and does not show signs of corrosion susceptibility.

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. See Appendix X1 for information regarding test selection. Edges shall be rounded lractice a fine final polish is required at all surface exclude the weld cap and root area.

ASTM A Testing: An Overview of Intergranular Corrosion | Element

The weight loss is calculated after each step, and reveals if the sample has been properly heat-treated. The test uses a visual inspection of the surface of the bent specimen to determine pass or fail. The Oxalic Acid test is also only applicable to corrosion associated with chromium carbide precipitates and is only useful for specific material grades.


This test method describes the procedure for conducting the ferric chloride corrosion test for detecting the presence of detrimental intermetallic phases in Duplex Stainless Steels. Asmt specification covers the standard practices for detecting susceptibility to intergranular attack in austenitic stainless steels.

Intergranular corrosion shows up as the dark black lines around the grain boundaries. News Project Details Tools. The test evaluates the resistance of extra-low-carbon steels to sensitization and intergranular attack from welding or heat treatment processes. This method pdactice a hour boiling test for “as received” specimens of stainless steel.

Intergranular Corrosion Testing: An Overview of ASTM A262

The Copper Sulfate Test is especially effective for determining susceptibility to intergranular attack for low carbon steels. Bend Specimen after soaking.

Based on your materials, application, r requirements, the other 4 methods provide specific focuses. This test is used exclusively to determine corrosion in areas high in chromium carbide formations, and is not as effective for intergranular attack caused by other means.

ASTM A Intergranular Corrosion Testing and Analysis

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This method is preferable for chromium depletions and corrosion in intermetallic phases. In SEM analysis, intergranular corrosion is clear by the dark lines where the grain boundaries are eaten away.