1 Scope
This standard specifies the requirements and test methods for autocatalytic nickel-phosphorus alloy coatings applied from aqueous solutions on to metallic substrates.
This standard does not apply to autocatalytic nickel-boron alloy coatings, nickel-phosphorus composites and ternary alloys.
Warning: The use of this standard may involve hazardous materials, operation and equipment. This standard does not purport to address all the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices, and determine the applicability of regulatory limitations prior to use.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this standard. However parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 2828.1 Sampling procedures for inspection by attributes - Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection (GB/T 2828.1-2003; ISO 2859-1: 1999, IDT)
GB/T 3138 Terminology for metallic coating, chemical treatment and related process (GB/T 31381995; neq ISO 2079: 1981)
GB/T 4955 Metallic coatings - Measurement of coating thickness - Coulometric method by anodic dissolution (GB/T 4955-2005; ISO 2177: 2003, IDT)
GB/T 4956 Non-magnetic coatings on magnetic substrates - Measurement of coating thickness - Magnetic method (GB/T 4956-2003; ISO 2178: 1982, IDT)
GB/T 5270 Metallic coatings on metallic substrates - Electrodeposited and chemically deposited coatings - Review of methods available for testing adhesion (GB/T 5270-2005; ISO 2819: 1980, IDT)
GB/T 6461 Methods for corrosion testing of metallic and other inorganic coatings on metallic substrates - Rating of test specimens and manufactured articles subjected to corrosion tests (GB/T 6461-2002; ISO 10289: 1999, IDT)
GB/T 6462 Metallic and oxide coatings - Measurement of coating thickness - Microscopical method (GB/T 6462-2005; ISO 1463: 2003, IDT)
GB/T 6463 Metallic and other inorganic coatings - Review of methods of measurement of thickness (GB/T 6463-2005; ISO 3882: 2003, IDT)
GB/T 9790 Metallic and related coatings - Vickers and knoop microhardness tests (GB/T 9790-1988; eqv ISO 4516: 1980)
GB/T 10125 Corrosion tests in artificial atmospheres - Salt spray tests (GB/T 10125-1997; eqv ISO 9227: 1990)
GB/T 10610 Geometrical product specifications (GPS) - Surface texture: Profile method - Rules and procedures for the assessment of surface texture (GB/T 10610-1998; eqv ISO 4288: 1996)
GB/T 11379 Metallic coatings - Electroplated coatings of chromium for engineering purposes (GB/T 11379-2008; ISO 6158: 2005, IDT)
GB/T 12332 Metallic coatings - Electroplated coatings of nickel for engineering purposes (GB/T 12332-2008; ISO 4526: 2004, IDT)
GB/T 12334 Metallic and other inorganic coatings - Definitions and conventions concerning the measurement of thickness (GB/T 12334-2001; ISO 2064: 1996, IDT)
GB/T 12609 Electrodeposited metallic coatings and related finishes - Sampling procedures for inspection by attributes (GB/T 12609-2005; ISO 4519: 1980, IDT)
GB/T 16921 Metallic coatings - Measurement of coating thickness-X-ray spectrometric methods (GB/T 16921-2005; ISO 3497: 2000, IDT)
GB/T 19349 Metallic and other inorganic coatings - Pretreatment of iron or steel to reduce the risk of hydrogen embrittlement (GB/T 19349-2003; ISO 9587: 1999, IDT)
GB/T 19350 Metallic and other inorganic coatings - Post-coating treatments of iron or steel to reduce the risk of hydrogen embrittlement (GB/T 19350-2003; ISO 9588: 1999, IDT)
GB/T 20015 Metallic and other inorganic coatings - Automated controlled shot-peening of metallic articles prior to nickel, autocatalytic nickel or chromium plating,or as a final finish (GB/T 20015-2005; ISO 12686: 1999, MOD)
GB/T 20018 Metallic and non-metallic coatings - Measurements of thickness - Beta backscatter methods (GB/T 20018-2005; ISO 3543: 2000, IDT)
ISO 2859-2 Sampling procedures for inspection by attributes - Part 2: Sampling plans indexed by limiting quality (LQ) for isolated lot inspection
ISO 2859-3 Sampling procedures for inspection by attributes - Part 3: Skip-lot sampling procedures
ISO 2859-4 Sampling procedures for inspection by attributes - Part 4: Procedures for assessment of declared quality levels
ISO 9220 Metallic coatings - Measurement of coating thickness - Scanning electron microscope method
ISO 10587 Metallic and other inorganic coatings - Test for residual embrittlement in both metallic-coated and uncoated externally-threaded articles and rods - Inclined wedge method
ISO 15724 Metallic and other inorganic coatings - Electrochemical measurement of diffusible hydrogen in steels - Barnacle electrode method
3 Terms and definitions
For the purposes of this standard, the terms and definitions specified in GB/T 3138, GB/T 12334, GB/T 19349 and GB/T 19350 apply.
Foreword i
Introduction iii
1 Scope
2 Normative references
3 Terms and definitions
4 Information to be supplied to the producer of the coating
5 Designation of basis metal, metal layers and heat treatment requirements
6 Requirements
7 Sampling
Annex A (Normative) Heat treatment to improve adhesion and increase hardness
Annex B (Informative) Thickness test methods
Annex C (Informative) Guidance on thickness, composition and use of autocatalytic nickel-phosphorus coatings
Annex D (Normative) Methods for chemical analysis of autocatalytic nickel-phosphorus coatings for phosphorus content
