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 In recent years GMP has been replaced by.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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Modify a garden duster to accept an air 5940p connection where the manual pump lever is located remove the manual pump lever and attach a fitting to accept the air line. Please note The test standard vm are for general guidance only.
If all solid materials are added dryan insoluble precipitate may result 3. The salt mist solution shall be as specified in Table 3. If specimen scribing is required, on either test panels or parts, follow the methods described in GMP.
This method also includes measurement of corrosion creepback from a scribe line, and describes how to evaluate corrosion formation in unscribed areas. If a recorder is not in use, written documentation should be provided indicating typical steady state conditions and the ramp times between steady states conditions. Both are excellent browsers. Figure 1 shows a completed coupon rack configuration.
A cycle is made up of the daily events or test inputs prescribed in Table 4.
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Do not intermix different coupon thickness on the same coupon rack. 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. Ramp time is to be included as part of the specified exposure period.
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 g the full test standard for further guidance.
GMP | Standards | Ascott Analytical
The spray nozzle shall be such that the salt solution is atomized into a mist as required. Engineering drawings and material specifications bm reference this test procedure must specify the test duration, A, B, G or D or the number of test cycles as indicated in Table 1. If a test is conducted with ramp times different than fm above, the number of cycles to reach coupon mass loss targets may increase or decrease.
Also, synergistic effects due to temperature, mechanical and electrical cycling can be comprehended by this test. The ambient shift can be modified to include additional test inputs such as dust, grit sprays, mechanical cycling, electrical 95440p, thermal inputs, grayelometer 95440p acid rain spray. This method does not propose to address all the safety problems associated with its use. Refer to Table 2 for targeted mass loss values, in milligrams, for various test durations as a function of the coupon’s original thickness.
See Table 4 for the steps that comprise the test method. This method may involve hazardous materials, operations and equipment. See Appendix A for typical modifications. Test durations A and B can be used as both QC tests and validation tests depending on the purpose of the test.
Prior to start of test, prepare the coupon rack with sufficient coupons to monitor the test 4. The test duration can be individually tailored to achieve any desired level of corrosion exposure.
The test procedure provides a combination of cyclic conditions salt solution, various temperatures, humidity, and ambient environment to accelerate metallic corrosion. To analyze coupons remove 1 coupon from each end of the rack and prepare for weighing and mass loss determination. Ambient Soak 8 h. In addition vm 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 and should 9540o photographic documentation and the coupon mass loss values.
At the option of the test requester, the test can be continued throughout weekends to decrease the over all test time. Also, the reasons why 9540 targeted value s was not obtained should be investigated and corrected before resuming the test.
In recent years GMP has been replaced by its successor; GMW, but this is all but identical in terms of the test conditions required. Additional options can be customized gk specific components or subsystems to increase the ability to conduct validation or development testing.