8/31/2023 0 Comments Paint scribe definitionThe arithmetic mean width of the corroded area on both sides of the scribe line is calculated for a number of locations along the scribe line, and ASTM D1654 uses that mean width to determine a rating number from 0 to 10, with 10 representing zero (0) corrosion creep.ĪSTM D1654 provides for evaluation of unscribed areas by reference to ASTM D714 for similar numeric evaluation of blistering of the painted surface, and ASTM D610 for numeric evaluation of rust coverage of the painted surface.ĪSTM D1654, ASTM D714, and ASTM D610 reference other ASTM, ISO, EN, DIN, and OEM standards which Assured Testing Services maintains on its ISO 17025 scope. a person who copies documents, esp a person who made handwritten copies before the invention of printing 2. The coating removal methods specified by ASTM D1654 include: Scraping with a spatula, picking off with a knife, chemical stripping of the coating, air blow-off, or power washing. ASTM D1654 describes the use of one of a number of methods to remove coating along the scribe line undercut by corrosion so that the full width of the corrosion creep width can be measured with a scale or caliper. The less corrosion creep on either side of the scribe, the higher the corrosion resistance performance. Common corrosion state evaluations listed below:ĪSTM D1654 uses corrosion creepage perpendicular to the scribe line as a quantitative measurement of corrosion performance. Following exposure, the samples are evaluated for corrosion resistance performance. Similar or identical ISO, EN, DIN, and OEM corrosive exposures are also applicable.ĪSTM D1654 “Test Method for Evaluation of Painted or Coated SpecimensĪSTM D610 “Standard Test Method for Evaluating Degree of Rusting on Painted Steel Surfaces”ĪSTM D714 “Standard Test Method for Evaluating Degree of Blistering of Paints”Īssured Testing Services places parts or panels inside corrosion resistance exposure chambers, exposing them continually for specified periods of time. ASTM D1654 then calls for the exposure of the scribed panels in one of a number of corrosion-inducing exposures, including ASTM B117, D822, D870, D1014, D1735, D2247, D2803, D4141, D4585, D4587, D5894, D 6695, G85, G87, and others. ASTM D1654 describes the scribing of coated samples through the coating layer and into the substrate using one of a number of scribe tools. The purpose of the ASTM D1654 test method is to provide a standardized procedure for the evaluation of corrosion performance of coatings and metal pretreatments subjected to one of a variety of corrosion resistance exposures.
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