GB/T 40793-2021 (English Version) PDF

Scope: This document specifies the code of the sintered NdFeB surface coating, the requirements of the substrate, preparation before coating, technical requirements, test methods and inspection rules. This document applies to protective and decorative coatings on the surface of sintered NdFeB permanent magnets, including conversion coatings such as phosphating or zirconium coatings, and coatings such as electrophoresis, spraying, and chemical vapor deposition.

GB/T 40793-2021 Referenced Document

GB/T 10125 Corrosion tests in artificial atmospheres—Salt spray tests
GB/T 13452.2-2008 Paints and varnishes.Determination of film thickness
GB/T 2423.22-2012 Environmental testing.Part 2:Test methods.Test N:Change of temperature
GB/T 2423.50 Environmental testing part 2: test method test Cy: constant damp heat is mainly used for accelerated testing of components
GB/T 3138 Metallic and other inorganic coatings.Surface treatment, metallic and other inorganic coatings.Vocabulary
GB/T 34491 Coatings for sintered neodymium iron boron permanent magnets
GB/T 39494-2020 Determination for coating adhesion of rare earth permanent magnetic materials for drive motor of new energy vehicle
GB/T 6739 Paints and varnishes—Determination of film hardness by pencil test*， 2022-12-30 Update
GB/T 6807 Specifications for phosphating treatment of iron and steel parts before painting
GB/T 8264 Glossary of painting terms
GB/T 9286 Paints and varnishes—Cross-cut test
QB/T 3814 Surface examination method of the metal deposits and conversion coatings for the light industrial products

2021 GB/T 40793-2021 Nonmetallic coatings for sintered neodymium iron boron permanent magnets