Astm B117 Free Extra Quality Download Pdfl

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Astm B117 Free Download Pdfl

Sample geometry, form and size of sample, and the environment were found to have a dramatic influence on the mass loss rate of each coating. Base coating acted as a shield for the cured inserts. Both salt spray and acid immersion showed no noticeable effect on the base coat and also inhibited the corrosion of the base coat. Depending on the application, the rate of mass loss varies from 18 to 141 mg / h. The ability of the base coat to inhibit corrosion depends on its precipitation chemistry. Microstructurally, the base coat consisted of acid-soluble components and contained fine zinc phosphate precipitates which made it capable of precipitation coating mode. The zinc phosphate precipitate is a protecting layer for and covers all the surface of zinc coated copper coil. Coarse zinc phosphate precipitates were observed to be coating like protective layer that prevent corrosion, and zinc hydroxide precipitates occasionally sprinkled on the surface of the base coat served as a protective layer for the bare copper insert inside the base coat.

The following table summarizes the resistance of the base coat and the insert against different test conditions. All conditions were tested using conventional ASTM B117 salt spray test. Resistance was measured as mass loss rate of the samples in the solution for 1000 hours followed by measuring the rate for another 1000 hours. Salt spray simulates the conditions found on automobile exterior surfaces. The slight increase in the rate at the second 1000 hours of these tests have been attributed to the instrumentation. The test procedures consistently showed mass loss rates for the insert less than those of the base coat for all exposure times. This indicates that the base coat is very effective corrosion inhibitor. The insert is protected from corrosion by the base coat and does not experience the galvanic couples that occur between the insert and the magnesium plated insert backing.

The base coat mass loss for 1000 hrs in the salt spray test is in μg/cm2. The insert corrosion rate for 1000 hrs in the salt spray test is in mg/cm2. Locations with the same coating system are coded with the same letter. The coatings that gave the lowest corrosion rate and weight loss in salt spray test are shown as bold.

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