GB/T 34491-2017 PDF English
US$225.00 · In stock · Download in 9 secondsGB/T 34491-2017: Coatings for sintered neodymium iron boron permanent magnets Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 34491-2017 | English | 225 |
Add to Cart
|
0-9 seconds. Auto-delivery
|
Coatings for sintered neodymium iron boron permanent magnets
| Valid |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB/T 34491-2017
GB/T 34491-2017: Coatings for sintered neodymium iron boron permanent magnets---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT34491-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.120.99
H 65
Coatings for Sintered Neodymium Iron Boron Permanent
Magnets
Issued on: OCTOBER 14, 2017
Implemented on: MAY 1, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative References... 4
3 Terms and Definitions... 5
4 Code of Coating... 6
5 Requirements for the Substrate, Preparation before Plating and Process... 7
6 Performance Requirements... 8
7 Test Methods... 10
8 Inspection Rules... 12
9 Marking, Packaging, Transportation, Storage and Quality Certificate... 14
Appendix A (Informative) Electroplating Process Guides... 15
Appendix B (Informative) Electroless Plating Process Guides... 17
Appendix C (Informative) Physical Vapor Deposition Process Guides... 18
Coatings for Sintered Neodymium Iron Boron Permanent
Magnets
1 Scope
This Standard specifies the code of single-layer coating and multi-layer composite coating,
substrate requirements, pre-plating preparation and process flow, performance requirements,
test methods, inspection rules and markings, packaging, transportation, storage and quality
certificates for the surface of sintered neodymium iron boron permanent magnet materials.
This Standard applies to protective and decorative coatings on the surface of sintered
neodymium iron boron permanent magnet materials, including coatings (hereinafter referred to
as coating products) using electroplating, electroless plating and physical vapor deposition
technology.
2 Normative References
The provisions in following documents become the essential provisions of this Document
through reference in this Document. For the dated documents, only the versions with the dates
indicated are applicable to this Document; for the undated documents, only the latest version
(including all the amendments) is applicable to this Document.
GB/T 2423.1 Environmental testing for electric and electronic products - Part 2.Test
methods - Tests A. Cold Delivery
GB/T 2423.8 Environmental testing for electric and electronic products - Parts 2.Test
methods - Test Ed. Free fall
GB/T 2423.17 Environmental testing for electric and electronic products - Part 2.Test
method - Test Ka. Salt mist
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 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 adhesion strength test methods
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/T 3814 Surface examination method of the metal deposits and conversion coatings for
light industrial products
3 Terms and Definitions
For the purposes of this Document, the terms and definitions given in GB/T 3138 and GB/T
12334, and the following apply.
3.1 Substrate
The substrate referred to in this Document refers to the workpiece that requires surface
treatment.
3.2 Electroplating
In order to obtain properties or dimensions that the substrate does not have, a metal or alloy
layer with good bonding strength is deposited on the substrate by electrolysis.
3.3 Barrel electroplating
An electroplating process in which bulk workpieces are electrodeposited in a rotating,
oscillating or otherwise moving container.
3.4 Vat plating (GB) or still plating (US)
Electroplating in which the parts to be plated are independently connected to the rack.
3.5 Electroless plating or actocalytic plating
5.2 The surface-treated workpiece can be of various shapes, and its dimensional deviation,
shape and position deviation, surface condition, etc. shall be accepted. The acceptance
requirements for workpieces with special shapes and large dimensional differences in different
directions shall be determined by negotiation between the supplier and the purchaser.
5.3 The size of the residual magnetism of the workpiece shall affect the quality of the coating,
and the supplier and the purchaser shall agree in advance before the plating process.
5.4 Chamfering should be performed before plating; and the radius of curvature after
chamfering is 0.1 mm~0.8 mm. There shall be no excessive chipping, scratches and abrasion
after chamfering.
5.5 Before plating, the workpiece shall be degreased and cleaned as required.
5.6 Electroplating, electroless plating and physical vapor deposition techniques are usually used
to coat the protective and decorative coatings on the surface of sintered NdFeB permanent
magnet materials. For process guidelines, see Appendixes A, B and C, respectively.
6 Performance Requirements
6.1 Appearance quality
6.1.1 The coating surface shall be free of rust spots, yellow marks, water stains and other bad
marks. The passivation film on the coating surface shall be complete and there shall not be
adhered whitening. On the main surface of the workpiece, there shall be no obvious coating
defects, such as blistering, pores, corner burrs, coating cracks or local coating absence and
coating shedding, etc., which are visible to the naked eye.
6.1.2 During vat plating, 2 to 4 visible and unavoidable conductive contact marks of the hanger
are allowed on the non-main surface; but this contact mark shall not expose the substrate and
does not affect the overall protective performance of the product.
6.2 Thickness
The coating in the center area of the outer surface of the sintered NdFeB sample is relatively
uniform. Under typical use environment conditions, the typical thickness range of various
coatings in this area is shown in Table 4.The coating thickness is the guarantee of providing
sufficient corrosion resistance. As the severity of the use environment increases, the coating
thickness shall also increase accordingly.
The coating appearance inspection of the coated product shall be carried out in accordance with
the provisions of QB/T 3814.
7.2 Thickness
The coating thickness is usually measured in accordance with the provisions of GB/T 16921.
When the coating thickness exceeds the detection range, it shall be carried out in accordance
with the provisions of GB/T 4955.In case of dispute, the provisions of GB/T 6462 may be
adopted. For the measurement of the coating thickness, it is usually recommended to select 3
to 5 points within the ϕ5 mm area of the center of the largest plane of the outer surface of the
sample, and then take the average value as the measurement result. The maximum allowable
deviation of the total coating thickness measurement is ±2 μm or the measured value × 15%,
whichever is greater.
7.3 Corrosion resistance test
7.3.1 Neutral salt spray test
The neutral salt spray test of the coating is carried out in accordance with the provisions of
GB/T 2423.17.The continuous spray test method is adopted. The test conditions are. 35℃ ±
2℃, 5%±1% NaCl solution (mass fraction), and the pH of the collected salt spray precipitation
solution is between 6.5 and 7.2.The specimen placement angle affects the test results. The
inclination angle of the specimen surface in the salt spray chamber is 45°±5°.
7.3.2 Damp heat test
The test shall be performed in accordance with the provisions of GB/T 2423.50.The test
conditions are. temperature 85 ℃ ±2 ℃, relative humidity 85%±5%.
7.3.3 Low temperature test
The test shall be performed in accordance with the provisions of GB/T 2423.1.
7.3.4 High pressure accelerated aging test
Put the specimen into a high pressure accelerated aging test device containing distilled water
or deionized water with a resistivity greater than 1.0 MΩ·cm. The test conditions for the
unsaturated mode are. temperature 120 ℃ ±2 ℃, air pressure 0.2 MPa, and relative humidity
controlled within the range of 1000 -5%; the test conditions for the more stringent saturated mode
are. temperature 120 ℃ ±2 ℃, air pressure 0.2 MPa, and relative humidity 100%.
7.4 Adhering strength test
7.4.1 Tensile test method
The test shall be performed in accordance with the provisions of GB/T 5210.The tensile test
method can quantitatively give the adhering strength value between the coating and the
substrate, which must be greater than the value agreed upon by the supplier and the purchaser.
7.4.2 Cross-cut method
The test shall be performed in accordance with the provisions of GB/T 5270.
7.4.3 Thermal shock test method
The adhering strength of nickel coating, nickel-copper-nickel coating and composite coating
with them as the bottom layer shall be tested according to the thermal shock test method
specified in GB/T 5270, heating to 250 ℃, keeping warm for 1 h, and cooling in water no
higher than 25 ℃.
7.4.4 High and low temperature impact test method
The test shall be performed according to the temperature change test Na specified in GB/T
2423.22-2012.
7.4.5 Drop test method
The test shall be performed according to the provisions of GB/T 2423.8.
8 Inspection Rules
8.1 Inspection and acceptance
8.1.1 The coating products shall be inspected by the supplier's quality inspection department to
ensure that the products meet the requirements of this Standard.
8.1.2 The purchaser shall inspect the received products according to the provisions of this
Standard. If the inspection results are inconsistent with the provisions of this Standard, they
shall be raised within 1 month from the date of receipt of the product and resolved through
negotiation between the supplier and the purchaser. If arbitration is required, the supplier shall
jointly take samples and entrust an inspection agency recognized by both parties to conduct
inspections.
8.2 Batching
Each batch of coated products shall be composed of the same production process and the same
specifications.
8.3 Inspection items
Each batch of coated products shall be subject to type inspection items such as appearance
quality, coating thickness, corrosion resistance and adhering strength.
8.4 Sampling
be unqualified.
9 Marking, Packaging, Transportation, Storage and Quality
Certificate
9.1 Marking
The coated products that pass the inspection shall have labels with the following contents.
a) Supplier name and address;
b) Stamp from the supplier’s quality inspection department;
c) Supplier’s inspection date.
9.2 Packaging
Coated products shall be packaged with clean soft materials and properly stored. The packaging
material shall not affect the performance of the coating.
9.3 Transportation and storage
Coated products shall be handled with care during transportation; stored in a dry environment
away from corrosion; the storage environment shall also be moisture-proof, away from heat
sources, strong magnetic fields, and avoid direct sunlight exposure.
9.4 Quality certificate
Each batch of coated products shall be accompanied by a quality certificate, indicating.
a) Supplier name;
b) Coated product name;
c) Batch number, number of pieces;
d) Results of various analysis and inspections and stamp from quality inspection department;
e) This standard number;
f) Inspection date;
g) Exit-factory date.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
Tips & Frequently Asked QuestionsQuestion 1: How long will the true-PDF of English version of GB/T 34491-2017 be delivered?Answer: The full copy PDF of English version of GB/T 34491-2017 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice. Question 2: Can I share the purchased PDF of GB/T 34491-2017_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 34491-2017_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet. Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. www.ChineseStandard.us -- GB/T 34491-2017 -- Click this link and select your country/currency to pay, the exact amount in your currency will be printed on the invoice. Full PDF will also be downloaded/emailed in 9 seconds. How to buy and download a true PDF of English version of GB/T 34491-2017?A step-by-step guide to download PDF of GB/T 34491-2017_EnglishStep 1: Visit website https://www.ChineseStandard.net (Pay in USD), or https://www.ChineseStandard.us (Pay in any currencies such as Euro, KRW, JPY, AUD).
Step 2: Search keyword "GB/T 34491-2017".
Step 3: Click "Add to Cart". If multiple PDFs are required, repeat steps 2 and 3 to add up to 12 PDFs to cart.
Step 4: Select payment option (Via payment agents Stripe or PayPal).
Step 5: Customize Tax Invoice -- Fill up your email etc.
Step 6: Click "Checkout".
Step 7: Make payment by credit card, PayPal, Google Pay etc. After the payment is completed and in 9 seconds, you will receive 2 emails attached with the purchased PDFs and PDF-invoice, respectively.
Step 8: Optional -- Go to download PDF.
Step 9: Optional -- Click Open/Download PDF to download PDFs and invoice.
See screenshots for above steps: Steps 1~3 Steps 4~6 Step 7 Step 8 Step 9
|