GB/T 30789.9-2014 《Paints and varnishes―Evaluation of degradation of coatings―Designation of quantity and size of defects,and of intensity of uniform changes in appearance―Part 9: Assessment of degree of filiform corrosion》 Related products

The GB/T 30789.9-2014 standard provides a method for assessing filamentous corrosion grades for Paints and varnish coatings. This section provides a quantitative assessment of filamentous corrosion by measurement of the length (L) of the longest filament (L) and the length (M) of the most frequent filament (M) in filamentous corrosion caused by scratch. The legend in Appendix A is used to illustrate the different grades of filament lengths to help standardize comparisons in practical tests. The standard provides clear steps and criteria for the evaluation of corrosion resistance of coatings, helping to guarantee the mass and durability of coatings.