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 In recent years GMP has been replaced by.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 test duration can be individually tailored to achieve any desired level of corrosion exposure.
If all solid materials are added dryan insoluble precipitate may result 3. The spray nozzle shall be such that the salt solution is atomized into a mist as required.
GM P Cyclic Accelerated Corrosion Analysis of Nonchromate Conversion – Google Books
The test duration is dictated by the number of test cycles. This is considered an out of date browser. The ambient shift can be modified to include additional test inputs such as dust, grit sprays, mechanical cycling, electrical cycling, thermal inputs, grayelometer and acid rain spray.
This method may involve hazardous materials, operations and equipment. Typical test duration is 4 cycles for under dash mid to high mount locations and 12 cycles for floorpan low mount locations which approximately equals 10 yearscosmetic corrosion exposure.
GMP | Standards | Ascott Analytical
Garden dusters with an 8 mm diameter hole for dust application are recommended to achieve the appropriate level of dust application. 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 9450p.
Wipe the coupons free of grit and weigh to determine the coupon mass loss using the formula: If a test is conducted with ramp times different than described above, the number of cycles to reach coupon mass loss targets may increase or decrease. The solution shall be sprayed as a mist for example, from a plastic bottle onto the test samples and coupons.
The salt mist solution shall be as specified in Table 3. Additional options can be customized to specific components or subsystems to increase the ability to conduct validation or development testing. However, thicker coupon sizes should be used for tests with long durations. Humidity ramp times between the ambient and wet condition and bm the wet and dry conditions are critical to test acceleration this is because corrosion rates are highest during this transition period.
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So this information should not be used as a substitute for referring to a complete test standard, ym an appropriate revision level. Modifications to the test may or may not 9450p equivalent levels of mass loss. Figure 1 shows a completed coupon rack configuration. Water fog or visible water droplets on parts – continuous after equilibrium is reached.
Both are excellent browsers. The coupons serve to monitor the average general bare steel corrosion produced by the test environment. Expected test duration to evaluate functional corrosion is 10 phases. Method Test specimens in the 940p 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 Conditions The test consists of alternating wet and dry cycles with precisely prepared salt solution. This website has been developed with modern browsers in mind to allow it to display at its best in a wide variety of viewing situations – including mobile viewing.
Longer test durations C and D and tests involving modifications are to be used for validation purposes only. Garden dusters from the following manufacturers could be modified: At the end of test the samples shall be rinsed with fresh tap water and allowed to dry before evaluating. 950p temperature and humidity conditions are shown in Table 3. The quantity of spray applied should be sufficient to rinse away any salt accumulation left from previous sprays.
One 1 test cycle is equal to 24 h, 1 phase is equal to 8 cycles. The latest revisions include: This study is a key reason why GMP became popular as an accelerated laboratory corrosion test for steel. 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. Test samples shall be representative of production intent.
Repeat the 9504p daily as necessary until the test duration requirements are met. The weight, in milligrams mgshall be recorded and retained for future reference. A phase is made up of a predetermined number of cycles, 8 cycles constitute 1 phase.
At the option of the test requester, the test can be continued throughout weekends to decrease the over all test time. These procedure modifications are based on field knowledge combined with engineering judgment to enhance the test’s ability to predict field performance.
Do not intermix different coupon thickness on the same coupon rack. Modify a garden duster to accept an air line connection where the manual pump lever is located remove the manual pump lever and attach a fitting to accept the air line.
A siphon spray powered by oil-free regulated air mg a hand operated pump spray may also be used. It is the responsibility of the user of this method to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. This procedure describes an accelerated laboratory corrosion test method to evaluate assemblies and components.
Test durations A and B can be used as both QC tests and validation tests depending on the purpose of the test. A cycle normally requires 1 day to complete. Contact Ascott for Further Information.