1.1 This test method covers qualitative testing of metallic coatings. 1.2 Metal coatings applied to fasteners are mainly to prevent corrosion and extend the life of the fasteners. The evaluation of metal coatings is mostly performed on thickness and composition. This method allows the evaluation of the actual performance of the applied coating to the fasteners. 1.3 Test methods for metal coatings, such as thickness, composition and salt fog are destructive, expensive and time consuming. This method allows fast, inexpensive and non-destructive testing of metallic coating applied in fasteners and interior of nuts. 1.4 The test method describes a procedure for polarization resistance measurements, which can be used to calculate the corrosion rate of metallic coatings on steel fasteners, studs, threaded parts and nuts. 1.5 The test method allows estimating the corrosion performance of metallic coatings in fasteners. 1.6 The test method allows the quality evaluation of the applied coating on fasteners. 1.7 The test involves the use of specific devices to carry out polarization resistance measurements on fasteners. 1.8 This method can be used for evaluating fasteners of most any size, diameter, thread count and length.
The standard is needed because it allow to check the performance of the metal coating on the threaded part. It allows purchaser, applicators and users to perform fast test to determine the performance of the metal coating applied to the part.
KeywordsQuality of Coatings, Fastener Coatings, Metal Coating, Corrosion rate, corrosion current, polarization resistance, coating performance, Non-destructive coating test, performance, corrosion, nuts, bolts, screws, fastener, nail
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
Draft Under Development