GMW14872 PDF

Search for: Corrosion Testing Standards The test standard summaries are for general guidance only. Though believed to be accurate at the time of writing, this may change over time. So this information should not be used as a substitute for referring to a complete test standard, at an appropriate revision level. In this context they can be considered to be equivalent and interchangeable terms. GMW Accelerated Corrosion Test General Motors This is an accelerated laboratory corrosion test method that can be used to determine the corrosion resistance of automotive assemblies and components.

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Search for: Corrosion Testing Standards The test standard summaries are for general guidance only. Though believed to be accurate at the time of writing, this may change over time.

So this information should not be used as a substitute for referring to a complete test standard, at an appropriate revision level. In this context they can be considered to be equivalent and interchangeable terms. GMW Accelerated Corrosion Test General Motors This is an accelerated laboratory corrosion test method that can be used to determine the corrosion resistance of automotive assemblies and components. It is said to be effective for evaluating a variety of corrosion mechanisms including general, galvanic, crevice etc.

This test is cyclic in nature, i. Test specimens are placed in an enclosed chamber and exposed to a changing climate that generally comprises of the following 3 part repeating cycle variations to this cycle are permitted depending on the type of component under test — refer to the full test standard for further guidance.

This is followed by 8. The number of cycle repeats and therefore the test duration is variable. For further information on General Motors standards visit; www.

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Corrosion Testing Standards

Like other corrosion tests GMW is performed to evaluate accelerated corrosion effects on assemblies and different components. A combination of cyclic conditions provides the right environment for this type of accelerated corrosion. It takes 24 hours to complete one full cycle under these conditions which include three 8-hour stages: an ambient stage which has frequent sprays of solution, humid stage which allows for a higher humidity followed by a dry stage. There are two choices when running the cycle on the weekends. Option one is to continue with the normal three stages that are run during the week days and option 2 is an ambient stage for the full 48 hours. Excluding weekends calls for a longer test duration as the accelerated corrosion process is not in effect. A big part of running a GMW test is the mass loss data collection.

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GMW 14872.pdf

An accelerated laboratory corrosion test to evaluate automotive coatings and components. Introduction In the American Iron and Steel Institute, in conjunction with a Committee of the SAE, conducted a study of existing cyclic corrosion tests in order to establish the best methods of predicting the performance of materials used in automotive applications. Twenty established corrosion test procedures were included within the study. The process itself comprised of undertaking tests on 10 different materials with each procedure, the results were compared to results gathered through real World exposure from 10 locations around the globe, undertaking the tests with identical materials.

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