GMW 14872 Corrosion Exposure Mechanical and Materials Tests

Automotive Tests

GMW 14872 Corrosion Exposure Mechanical and Materials Tests

Eurolab Laboratory offers cyclic corrosion testing in accordance with GMW 17020 as reflected in ISO 14872. This test consists of alternating cycles of electrolyte (salt) exposure, a drying phase, and a moisture exposure phase.

GMW 14872 Corrosion Exposure Mechanical and Materials Tests

GMW 14872 is widely recognized as a leading cyclic corrosion test in the automotive industry and is used by many defense contractors in addition to General Motors.

Like other corrosion tests, GMW 14872 is performed to evaluate the effects of accelerated corrosion on assemblies and different components. A combination of cyclical conditions provides the right environment for this type of accelerated corrosion. A full cycle takes 8 hours to complete under these conditions, which includes three 24-hour phases; an ambient phase with frequent solution sprays, a moist phase allowing higher humidity, followed by a dry phase. There are two options when running the loop on weekends. Option one is to continue with the usual three phases run on weekdays and option 2 is an ambient phase for the full 48 hours. Excluding weekends, a longer test period is required as the accelerated corrosion process is not active.

GMW 14872 The solution consists of sodium chloride (NaCl), calcium chloride (CaC2) and sodium bicarbonate (NaHCOs3). A large part of testing a GMW 14872 run is mass loss data collection. Mass loss coupons are special steel chips that have been extensively tested to measure the abrasiveness of the test. Based on the test variation selected from the various test options, a specific mass loss chart should be followed. There are two methods to choose from (Method 1/2, Method 3), followed by the vehicle area corresponding to Underbody (UB), Underhood (UH), Exterior (EXT), Secondary Surface (SS) and Interior (INT). marks. The number of salt sprays can vary for each vehicle area, as certain areas are more subject to environmental corrosion than others. With a choice of five exposures (A – E), a mass loss value is obtained based on the number of sprays per cycle. Each of these values ​​has a plus/minus range that can conclude a test when the mass loss target is met.

As Eurolab laboratory, we provide the best service to you, our manufacturers, with our experienced and professional staff within the scope of all automotive standards. Our laboratory and test team work diligently to provide the best service for manufacturers.

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