Nitric Acid, ASTM A, Practice C, (Huey Test) The specimens are boiled for five periods, each of 48 hours, in a 65 per cent solution of nitric acid. The corrosion. employed to measure the relative susceptibility of austenitic stainless steels to intergranular attack. ASTM A Practice C, boiling nitric acid test is also known . Ferric Sulfate – Sulfuric Acid, ASTM A – Practice B (Stretcher Test). Ferric Sulfate Nitric Acid, ASTM A, Practice C, (Huey Test). Nitric Acid, ASTM A

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The inch-pound equivalents are in parentheses and may be approximate. The Oxalic Acid test is also only applicable to corrosion associated with chromium carbide precipitates and is only useful for specific material grades.

A recent publication on intergranular corrosion.

ASTM A Testing: An Overview of Intergranular Corrosion | Element

Please share this page: Practice A, the oxalic acid etch test is used as a rapid technique to screen samples of certain stainless steel grades to ensure they are not susceptible to intergranular attack sensitization. This abstract is a brief summary of the referenced standard.

Duplicate samples from both sides of a sheet sample are evaluated to determine if carburization results in intergranular attack. If you are not sure, please contact us for assistance.

The weight loss is calculated after each step, and reveals if the sample has been properly heat-treated. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

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Our knowledgeable scientists have the experience and expertise necessary to determine the most appropriate intergranular attack testing methods for your material while providing actionable results you can rely on. Like what you saw? This method is preferable for chromium depletions and corrosion in intermetallic phases.

Learn more about our laboratories – where they are located; the unique capabilities they have and how they can help you solve your technical and commercial challenges.

Choosing the correct method s rely on a complete understanding pracice your material and processes, as well as the concept of corrosion itself.

Share on Tumblr Print. For example, many low-carbon and stabilized stainless steels e. These tests are often run as a qualification test to ensure each batch of stainless steel is properly prepared.

Corrosion Testing

Each ASTM A Practice specification includes a list of the grades of stainless steels and the acceptable etch structures for the specific alloys. Some specific hazards statements are given in Practice B, also known as the Streicher test, uses weight loss analysis to provide a quantitative measure of the materials performance.

All five methods within this specification involve exposing specimens to a chemical mixture designed to encourage corrosive behavior. See Appendix X1 for information regarding test selection.

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. A bend test followed by a visual or micro-examination are used to determine “Pass” or “Fail” of test specimens.


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.

Link to Active This link will pracrice route to the current Active version of the standard. The Strauss test is commonly used to evaluate the heat-treatment of as-received material, the effectiveness of alloying additions of elements such as Nb and Ti, or the effectiveness of reducing carbon content to resist intergranular attack.

Historical Version s – view previous versions of standard Work Item s – proposed revisions of this standard Translated Version s: Sensitization causes the grain boundaries of a material to precipitate, creating carbide deposits practtice causing the material to be susceptible to intergranular attack. In SEM analysis, intergranular corrosion is practixe by the dark lines where the grain boundaries are eaten away. Intergranular corrosion shows up as the dark black lines around the grain boundaries.

The samples are weighed at each interval to determine mass loss and degree of susceptibility to intergranular attack. We provide intergranular corrosion evaluation, salt spray testing, stress corrosion, and various other methods to simulate exposure of your products or materials to corrosive environments.