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 In recent years GMP has been replaced by. of the reference specimens in the as-received condition are in Figure 3. The salt fog test used an abbreviated procedure (Table 3) of the standard GMP test. Find the most up-to-date version of GMP at Engineering

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The coupon mass loss values shown in Table 2 are used to verify that the correct amount of corrosion has been produced by the test. Any option changes not called out specifically in this Appendix must be included on the engineering drawing. The bolt, nut and washers shall be made from a non black plastic material, preferably nylon. The coupons serve to mg the average general bare steel corrosion produced by the test environment.

Longer test durations C and D and tests involving modifications are to be used for validation purposes only. Humidity ramp times between the ambient and wet condition and between the wet and dry conditions are critical to test acceleration this is because corrosion rates are highest during this transition period. Four 4 coupon thicknesses are available as shown in Table 2.

Ambient Soak 8 h. Corrosion coupons shall be removed and analyzed after each phase throughout the test to monitor the corrosion. Both are excellent browsers. Coupons consist of Test samples shall be representative of production intent. 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.

This standard was written by a task group and approved by the Letter Ballot Committee in February A cycle is made up of the daily events or test inputs prescribed in Table 4. The number of coupons required for different test durations are shown in Table 1. The test can be started at any time with the understanding that 24 h constitutes 1 cycle. Gj to the test may or may not attain equivalent levels of mass loss. The latest revisions include: Modify a garden duster to accept an air line connection where the ggm pump lever is located remove the manual pump lever and attach a fitting to accept the air line.


GMP | Standards | Ascott Analytical

Vm options can be customized to specific components or subsystems to increase the ability to conduct validation or development testing. The procedure is effective for evaluating a variety of corrosion mechanisms, such as general, galvanic, crevice, etc.

Coupon mass loss targets for every phase are not included in Table 2. The humidity cabinet shall be as specified by GMP and Table 3. 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.

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Use Option IV – for door detents without weatherseal protection Use Option VI – for door detents with weatherseal protection 1 test cycle hm equal to 24 h, 1 phase is equal to 8 cycles. Also, the reasons why the targeted value s was not obtained should be investigated and corrected before resuming the test. This procedure describes an accelerated laboratory corrosion test gk to evaluate assemblies and components. 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.

Test equipment used shall be documented and include vm following information: Test acceleration can be optimized and tracked by using standard corrosion coupons as monitoring devices.


9540o believed to be accurate at the time of writing, this may change over time. This method may involve hazardous materials, operations and equipment. The test procedure provides a combination of cyclic conditions salt solution, various temperatures, humidity, and ambient environment to accelerate metallic corrosion.

The test sample s shall be inspected for corrosion and photographed at the end of predetermined cycles. Wipe the coupons free of grit and weigh to determine the coupon mass loss using the formula: Test Conditions The test consists of alternating wet 954p0 dry cycles with precisely prepared salt solution. In addition to the sample data and test results, reports must indicate the total number of cycles run, any modifications to the test see Appendix Athe Equipment and Test Record Form Appendix B 5940p should include photographic documentation and the coupon mass loss values.

This method also includes measurement of corrosion creepback from a scribe line, and describes how to evaluate corrosion formation in unscribed areas.

So this information should not be used as 954p0 substitute for referring to a complete test standard, at an appropriate revision level. One 1 test cycle is equal to 24 h, 1 phase is equal to 8 cycles. This procedure supersedes any old procedures that may have referenced an “A” or “B” Test Method Method A is eliminated. Test durations A and B can be used for quality 954p0 and validation procedures as appropriate.

See Table 4 for the steps that comprise the test method. In this context they can be considered to be equivalent and interchangeable terms.