GB/T 34491-2017 in English

Overview of sintered NdFeB surface coating standards

This standard GB/T 34491-2017 specifies the code, substrate requirements, pre-plating preparation and process, performance requirements, test methods, inspection rules and markings, packaging, transportation, storage and quality certificates for single-layer coatings and multi-layer composite coatings on the surface of sintered NdFeB permanent magnet materials. It is applicable to the surface protection and decorative coatings of sintered NdFeB permanent magnet materials using electroplating, chemical plating and physical vapor deposition technology.

Comparison table of standard frameworks

Explanation of professional terms and practical application cases

Recommendations for standard implementation

1. Choose the appropriate coating process:Choose electroplating, chemical plating or PVD technology according to the use environment. For example, in a highly corrosive environment, chemical nickel plating is recommended.
2. Strictly control the coating thickness: Ensure that the coating thickness is within the typical value range (such as Ni 5~20μm) to meet the requirements of corrosion resistance and bonding strength.
3. Optimize post-processing technology: Select blue-white passivation, color passivation or black passivation according to the coating type to improve the protective performance and decorative effect.
4. Strengthen quality inspection: Strictly carry out appearance quality, thickness and corrosion resistance inspections in accordance with the standards to ensure that the products meet the requirements of GB/T 34491.