Metal Finishing Guide Book

2012 Organic Finishing Guidebook Issue

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Page 294 of 331

troduced into the accelerated cor- rosion test. ASTM Standards D 1654 Standard Test Method for Evaluation of Painted or Coated Specimen Subjected to Corrosive Environments, D 610 Standard Test Method for Evaluating Degree of Rusting on Painted Steel Sur- faces, and D 714 Standard Test for Evaluating Degree of Blistering of Paints were developed to provide common standards against which to compare the results obtained. These standards are summarized below. ISSUES Primary issues that arise when dis- cussing the usefulness of acceler- ated corrosion tests are compari- son to real-world exposure and the consistency of test results. Accelerated corrosion tests are performed under controlled con- ditions with a limited number of variables, which cannot duplicate the vast variety of variables that oc- cur in any one location in a real- world environment. Comparison standards can be used to compen- sate for this. These are test pieces from a product with a known track record in a real-world environment that after being exposed to an ac- celerated corrosion test environ- ment exhibit acceptable perfor- mance. They then can be used as standards against which other test pieces are compared.This process helps developers and quality pro- fessionals predict how anew prod- uct or production run of an existing product will perform when used. It is usually not possible, unless com- parative outdoor or "in-service" ex- posure data are available, to directly compare any given number of hours in an accelerated corrosion test with a given number of years Accelerated Corrosion Test Chambers Automated. Reliable. Accurate. Since 1947 888.456.0643 293

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