13 Aug Scope—The SAE J lab test procedure should be used when determining cosmetic corrosion performance for a particular coating system. SAE J Cosmetic Corrosion Lab Test. This test procedure has been field correlated, so it is claimed that the results obtained should correlate well to those . Salt Spray test (ASTM B) with exposures up to hours and the Cyclic Corrosion test (SAE J) with exposures up to and cycles. The latter.
|Published (Last):||2 February 2009|
|PDF File Size:||16.14 Mb|
|ePub File Size:||13.54 Mb|
|Price:||Free* [*Free Regsitration Required]|
The test panels were mounted on the vehicles in both horizontal and vertical orientations to better represent the various surface orientations typically found in vehicle applications.
The reason that the ASTM B test methods do not accurately reproduce corrosion performance for auto parts is that they do not accurately reproduce the conditions in which automotive parts must exist. There are several problems with ASTM B salt spray test when trying to rank the corrosion performance of automotive parts.
When this is the case, you extend the dry stage over the weekend. This group strived to develop the knowledge of corrosion mechanisms and their replication u2334 a controlled environment until, nearly 20 years later and after considering over available laboratory, proving ground, and outdoor corrosion tests, the SAE Surface Vehicle Standard, J Cosmetic Corrosion Lab Test, was published in June These differences can lead to differences in test results.
Sorry. You need to upgrade your browser
It is also used elsewhere in the world where these auto companies have satellite manufacturing facilities, or joint collaborative ventures with other auto manufacturers.
Then, assuming that they are actually improvements, they will revise the standard and submit it to SAE. The number of cycle repeats and therefore the test duration is variable. Researchers are also working on improving the method for salt application. In one test, they mounted panels of the standard materials on pickup trucks driven in Montreal, Quebec, and St. Several studies have come to the conclusion that ASTM B does not provide a good test for coated aluminum alloys, or fails to predict the composition effects of aluminum-zinc alloy coatings on cold-rolled steel, or any other coatings for this matter.
Test Conditions Test specimens are placed in an enclosed chamber and exposed to a changing climate that comprises of the following 3 part repeating cycle. In this context they can be considered to be equivalent and interchangeable terms. Both are excellent browsers.
When run manually, the standard allows for the fact that test personnel may not be available during weekends. The SAE J test showed the best correlation.
To determine the real-world performance of these materials, researchers then ran a series of tests. The analysis xae that 80 cycles of the SAE J test corresponded to five years of on-vehicle testing. Another difference between the conditions in a salt spray test and real-world conditions is the salt concentration.
SAE J | Standards | Ascott Analytical
At least two substrates were chosen because the existence of proven corrosion testing results enabled them to be used to assure the consistency of the test.
So this information should not be used as a substitute for referring to a complete test standard, at an appropriate revision level. Spray Method — periodic or continuous direct impingement spray of the salt solution over the 15 minute interval that ensures that the test specimens are kept wet for the entire 15 minute interval.
Contact Ascott for Further Information. But we haven’t supported older browsers like IE8.
Test method SAE J2334
They h2334 the trucks for five years and then measured the corrosion performance of the materials. For one thing, parts tested in a salt-spray cabinet are continuously wet, while those parts on a vehicle experience periods of wetness and dryness.
The samples must be subject to an application of salt solution consisting of the following formulas and by use of one of three methods j233 as follows; 0. You can run the tests manually or automatically. The corrosion mechanisms of on-vehicle and laboratory tests were studied by Lehigh University, and the resulting analysis showed that similar corrosion products and modes were found in these tests as were found after conducting SAE J tests.
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. Inthey selected ten standard materials, including coated and uncoated parts, with a wide range of coating compositions and thicknesses.
J234 test cycle is repeated daily, fully automatic cabinets have the option of running during the weekends or programming in a dry stage soak. Test specimens are placed in an enclosed chamber and exposed to a changing climate that comprises of the following 3 part repeating cycle.
One method of testing which was shown to be particularly indicative of the performance of components in the conditions in which vehicles operate was the Cyclic Corrosion Test CCT.