GM 9540P PDF

This study is a key reason why GMP became popular as an accelerated laboratory corrosion test for steel. In recent years GMP has been replaced by its successor; GMW, but this is all but identical in terms of the test conditions required. Test Conditions The test consists of alternating wet and dry cycles with precisely prepared salt solution. Method Test specimens in the enclosed chamber are 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.

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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. GMP 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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Fenrinos Ramp time is to be included as part of the specified exposure period. This website has been developed with modern browsers in mind to allow it to display at its best in bm wide variety of viewing situations — including mobile viewing. Test durations A and B can be used as both QC tests and validation tm depending on the purpose of the test. If gravelometer exposure is required, test samples not coupons may be exposed to gravelometer testing per GMP before or during exposure. Test equipment used shall be documented and include the following information: Fm specimens in the enclosed chamber are 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 — pp to the full test standard for further guidance. Typically, the time from ambient to the wet condition should be approximately 1 h and the transition time between wet and dry conditions should be approximately 3 h. Repeat the cycle daily as necessary until the test duration requirements are met.

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Corrosion Testing Standards

Meztiramar Typical Application Originally developed by General Motors the standard has gained popularity for corrosion tests within the automotive industry and has also become the preferred corrosion test of the US Navy. A siphon spray powered by oil-free regulated air or a hand operated pump spray may also be used. Use Option IV — for door detents without weatherseal protection Use Option VI — for door detents with weatherseal protection 1 test cycle is equal to 24 h, 1 phase is equal to 8 cycles. Typically, the time from ambient to the wet condition should be approximately 1 h and the transition time between wet and dry conditions should be o 3 h. Water fog or visible water droplets on parts — continuous after equilibrium is reached. This process can be aided by using a commercial grade degreaser prior to methanol or acetone clean. To check test progress and assure that the test is being run correctly, assume a linear corrosion rate.

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GM 9540P PDF

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