Standard No.:	GB/T 34491-2017
English Name:	Coatings for sintered neodymium iron boron permanent magnets
Chinese Name:	烧结钕铁硼表面镀层
Chinese Classification:	H65    Rare metals and their alloys
Professional Classification:	GB    National Standard
ICS Classification:	77.120.99 77.120.99    Other non-ferrous metals and their alloys 77.120.99
Source Content Issued by:	AQSIQ; SAC
Issued on:	2017-10-14
Implemented on:	2018-5-1
Status:	valid
Target Language:	English
File Format:	PDF
Word Count:	7500 words
Translation Price(USD):	220.0
Delivery:	via email in 1 business day

GB/T 34491-2017 Coatings for sintered neodymium iron boron permanent magnets 1 Scope This standard specifies the codes, substrate requirements, pre-plating preparation and process, property requirements, test methods, inspection rules and marking, packaging, transportation, storage and quality certificates of single-layer coatings and multi-layer composite coatings for sintered neodymium iron boron permanent magnets. This standard applies to protective and decorative coatings for sintered neodymium iron boron permanent magnets, including coatings plated by using electroplating, electroless plating and physical vapour deposition (hereinafter referred to as coating products). 2 Normative References The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 2423.1 Environmental testing for electric and electronic products - Part 2: Test methods - Tests A: Cold GB/T 2423.8 Environmental testing for electric and electronic products - Part 2: Test methods - Test Ed: Free fall GB/T 2423.17 Environmental testing for electric and electronic products - Part 2: Test methods - Test Ka: Salt mist GB/T 2423.22-2012 Environmental testing - Part 2: Tests methods - Test N: Change of temperature GB/T 2423.50 Environmental testing - Part 2: Test methods - Test Cy: Damp heat, steady state, accelerated test primarily intended for components GB/T 3138 Metallic and other inorganic coatings - Surface treatment, metallic and other inorganic coatings - Vocabulary GB/T 4955 Metallic coatings - Measurement of coating thickness - Coulometric method by anodic dissolution GB/T 5210 Paints and varnishes - Pull-off test for adhesion GB/T 5270 Metallic coatings on metallic substrates - Electrodeposited and chemically deposited coatings - Review of methods available for testing adhesion GB/T 6462 Metallic and oxide coatings - Measurement of coating thickness - Microscopical method GB/T 12334 Metallic and other inorganic coatings - Definitions and conventions concerning the measurement of thickness GB/T 13560 Sintered neodymium iron boron permanent magnets GB/T 16921 Metallic coatings - Measurement of coating thickness - X-ray spectrometric methods QB/T3814 Surface examination method of the metal deposits and conversion coatings for the light industrial products 3 Terms and Definitions For the purposes of this document, the terms and definitions specified in GB/T 3138 and GB/T 12334 and the following apply. 3.1 substrate workpiece that requires surface treatment

Contents Foreword i 1 Scope 2 Normative References 3 Terms and Definitions 4 Coating code 5 Requirements of substrate, preparation before plating, and process 6 Properties 7 Test method 8 Inspection rules 9 Marking, packaging, transportation, storage and quality certificate Annex A (Informative) Electroplating process guide Annex B (Informative) Electroless plating process guide Annex C (Informative) Physical vapor deposition process guide