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GB/T 11376-2020 English PDF (GB/T 11376-1997, GB/T 11376-1989)

GB/T 11376-2020_English: PDF (GB/T11376-2020)
Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
GB/T 11376-2020English330 Add to Cart 0--9 seconds. Auto-delivery Metallic and other inorganic coatings--Phosphate conversion coating of metals Valid GB/T 11376-2020
GB/T 11376-1997English115 Add to Cart 0--9 seconds. Auto-delivery Phosphate conversion coatings for metals Obsolete GB/T 11376-1997
GB/T 11376-1989EnglishRFQ ASK 3 days [Need to translate] Phosphate conversion coatings for metals Obsolete GB/T 11376-1989


BASIC DATA
Standard ID GB/T 11376-2020 (GB/T11376-2020)
Description (Translated English) Metallic and other inorganic coatings--Phosphate conversion coating of metals
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard A29
Classification of International Standard 25.220.20
Word Count Estimation 18,150
Date of Issue 2020-06-02
Date of Implementation 2021-04-01
Drafting Organization Wuhan Material Protection Research Institute Co., Ltd., Wuhan Material Protection Surface New Material Co., Ltd., Zhaoqing College, Hexing Automotive Electronics Co., Ltd., Wenzhou Ruiming Industry Co., Ltd., Foshan Kefu Technology Co., Ltd.
Administrative Organization National Technical Committee for Standardization of Metallic and Non-metallic Coatings (SAC/TC 57)
Proposing organization China Machinery Industry Federation
Issuing agency(ies) State Administration for Market Regulation, National Standardization Administration

BASIC DATA
Standard ID GB/T 11376-1997 (GB/T11376-1997)
Description (Translated English) Phosphate conversion coatings for metals
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard A29
Classification of International Standard 25.220.40
Word Count Estimation 13,114
Date of Issue 1997/7/25
Date of Implementation 1998/2/1
Older Standard (superseded by this standard) GB 11376-1989
Adopted Standard ISO 9717-1990, MOD
Drafting Organization Wuhan Institute of Materials Protection Ministry of Machinery Industry
Administrative Organization National Metal and nonmetal cover layer Standardization Technical Committee
Proposing organization Ministry of Machinery Industry of the People Republic of China
Issuing agency(ies) State Bureau of Technical Supervision
Summary This standard specifies the requirements for determining the phosphate conversion coating method is mainly applied to ferrous metals, aluminum, zinc, cadmium and its alloys.

BASIC DATA
Standard ID GB/T 11376-1989 (GB/T11376-1989)
Description (Translated English) Phosphate conversion coatings for metals
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard A29
Date of Issue 1989/4/22


GB/T 11376-2020 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 25.220.20 A 29 Replacing GB/T 11376-1997 Metallic and other inorganic coatings - Phosphate conversion coating of metals (ISO 9717:2017, MOD) ISSUED ON: JUNE 02, 2020 IMPLEMENTED ON: APRIL 01, 2021 Issued by: State Administration for Market Regulation; Standardization Administration of the People’s Republic of China. Table of Contents Foreword ... 3 Introduction ... 5 1 Scope ... 6 2 Normative references ... 6 3 Terms and definitions ... 7 4 Information to be supplied by the purchaser to the processor ... 7 5 Phosphate conversion coating types and designation ... 8 5.1 Phosphate conversion coating types ... 8 5.2 Designation of phosphate conversion coating ... 8 6 Phosphate conversion coating ... 9 6.1 Appearance ... 9 6.2 Coating mass per unit area ... 9 6.3 Post treatments ... 10 6.4 Phosphate conversion coating thickness ... 10 7 Heat treatment ... 10 Appendix A (Informative) General information ... 11 Appendix B (Informative) Identification of phosphate conversion coating ... 15 Appendix C (Normative) Determination of phosphate conversion coating resistance to neutral salt spray test ... 17 References ... 20 Metallic and other inorganic coatings - Phosphate conversion coating of metals Warning — This Standard calls for the use of substances and/or procedures that could be injurious to health if adequate safety measures are not taken. This Standard does not address any health hazards, safety or environmental matters associated with its use. It is the responsibility of the producers, purchasers and/or users of this document to establish appropriate health, safety and environmentally acceptable practices and take appropriate actions. 1 Scope This Standard specifies methods for determining the requirements for phosphate conversion coating. This Standard applies to ferrous materials, aluminum, zinc, cadmium and their alloys (see Appendix A). 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 3138, Metallic and other inorganic coatings - Surface treatment, metallic and other inorganic coatings - Vocabulary (GB/T 3138-2015, ISO 2080:2008, IDT) 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 9792, Conversion coatings on metallic materials - Determination of coating mass per unit area - Gravimetric methods (GB/T 9792-2003, ISO 3892:2000, MOD) GB/T 10125, Corrosion tests in artificial atmospheres - Salt spray tests (GB/T 10125-2012, ISO 9227:2006, 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) ISO 27830, Metallic and other inorganic coatings - Requirements for the designation of metallic and inorganic coatings 3 Terms and definitions For the purposes of this document, the terms and definitions given in GB/T 3138 apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: — IEC Electropedia: available at http://www.electropedia.org/; — ISO Online browsing platform: available at http://www.iso.org/obp. 4 Information to be supplied by the purchaser to the processor The following information shall be provided by the purchaser. a) A description of the phosphate conversion coating according to this document (see 5.2). b) In cases of steel parts with tensile strength not less than 1 000 MPa, possibly also locally restricted, e.g. for case-hardened or cold-formed structures or in weld seam areas, the safety against hydrogen embrittlement is of primary importance. The phosphatising process shall be carried out in such a manner that any damage caused by hydrogen-induced brittleness is excluded. Technical measures to minimize the risk of hydrogen-induced brittleness shall be provided by the supplier and the customer. Heat treatment in accordance with any recommendations cannot guarantee full freedom from hydrogen embrittlement. The performance of the heat treatment shall be demonstrated by the supplier. c) The sampling procedure, the acceptable quality limit or any other requirements and tests that deviate from GB/T 12609. d) The surface treatment or phosphating. e) The appearance of the surface. f) The corrosion resistance. g) a symbol, which indicates the function of the conversion coating as follows: 1) e – electrical insulation; 2) g – reduction of friction (sliding action); 3) r – adhesion promoter and/or corrosion protection; 4) z – simplification of cold forming. h) a solidus “/”. i) a number, which indicates the surface-related mass per square meter, in g/m2, with a measurement uncertainty of ±30%. If the phosphate coating receives a supplementary treatment, the following information shall be added to the designation: j) a solidus “/”. k) a symbol, which defines the supplementary treatment (see Table 2). If necessary, mark additional information according to the following principles: Solidi “/” shall be used to separate data fields in the designation corresponding to the different sequential processing steps. Double separators or solidi indicate that a step in the process is either not required or has been omitted (see ISO 27830). 6 Phosphate conversion coating 6.1 Appearance Zinc phosphate, zinc calcium phosphate and manganese phosphate coatings shall evenly cover the metal surface and shall not show any white stains, corrosion products or fingerprints. Note: Slight fluctuations in the appearance of phosphate coatings because of contact with frames, properties of the base material or through minor contact inside the drum do not constitute any reason for claim. 6.2 Coating mass per unit area The coating mass is measured in accordance with the procedures specified in GB/T 9792. Appendix B (Informative) Identification of phosphate conversion coating B.1 General This Appendix describes methods for identifying the type of phosphate conversion coating. The methods are applicable to coatings containing phosphorus, iron, manganese, zinc and calcium. They are not applicable to the detection of iron or zinc if these metals are present in the basis material. B.2 Method 1 B.2.1 Principle Removal of the phosphate conversion coating from a test specimen by treatment with sodium hydroxide solution. Detection of the elements present in the solution by any suitable instrumental analytical technique, e.g., atomic absorption spectrometry. B.2.2 Reagents During the analysis, use only reagents of recognized analytical grade and deionized water (or water of equivalent purity). B.2.2.1 Sodium hydroxide solution, 50 g/L. B.2.3 Apparatus Use ordinary laboratory apparatus and any appropriate instrument suitably equipped for the detection of phosphorus, manganese, zinc and calcium, e.g., an atomic absorption spectrometer for metals. B.2.4 Test specimen Use a test specimen having a total coated surface area of approximately 100 cm2. B.2.5 Procedure Immerse the test specimen, of which the specifications are defined in B.2.4, in 100 mL of the sodium hydroxide solution (B.2.2.1) maintained at a temperature of 80 °C ~ 90 °C, until the coating has been removed or has at least undergone obvious attack. If necessary, remove the coating by rubbing it with a rubber squeegee. Using the appropriate analytical instrument (B.2.3), detect whether the elements, such as phosphorus, manganese, zinc and calcium, are present in the test solution. the liquid, semi-solid or waxy film which forms on the phosphated surface is free from air bubbles and discontinuities. Before testing, suspend the test pieces for at least 24 h at a temperature of 23 °C ± 5 °C and a relative humidity not exceeding 65%, in a dust and draught-free atmosphere, so as to allow the surplus of oil to drip off and the solvents to evaporate. C.3.2.2 Comparative testing Suspend the phosphated test pieces (previously dried at a temperature of 100 °C ~ 120 °C and cooled to room temperature) from suitable plastic hooks or plastic-coated steel hooks and immerse them vertically in the oil for 1 min at a temperature of 25 °C ± 2 °C. During this time, move the test panels gently to and fro and then withdraw them gradually from the oil in about 30 s. The oil film that forms on the phosphated surface shall be free from air bubbles and discontinuities. Suspend the test panels for at least 24 h at a temperature of 23 °C ± 5 °C and a relative humidity not exceeding 65%, in a dust and draught-free atmosphere, prior to testing. C.3.3 Salt spray test Subject the post-treated components or test panels (see C.3.2) to the neutral salt spray test (see GB/T 10125). This test determines the exposure times attainable by a specific corrosion-protecting system before the first evidence of corrosion of metal becomes visible. For this purpose, take test pieces from the test chamber at predetermined intervals and examine them visually for evidence of corrosion. Whether or not the after-treatment film (or layer) is to be removed before visually examining the components or test panels is subject to agreement. For a specific phosphate coating, considerable scatter occurs in the exposure times up to the first occurrence of corrosion, depending on the composition of the supplementary treatment medium (corrosion-preventing oils, greases and waxes) category, composition and mass per unit of the phosphate conversion coating. ......


GB/T 11376-1997 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 61.060 Y 78 Replacing GB 11376-89 Phosphate conversion coatings for metals (ISO 9717.1990, eqv) ISSUED ON. JULY 25, 1997 IMPLEMENTED ON. FEBRUARY 1, 1998 Issued by. State Bureau of Technical Supervision Table of Contents Foreword ... 4  ISO Foreword ... 5  Introduction ... 6  1 Scope ... 6  2 Normative references ... 6  3 Information to be supplied by the purchaser to the coater ... 7  4 Classification codes of phosphating coating ... 8  5 Sampling ... 9  6 Treatment of basis metals before phosphating ... 9  7 Phosphate conversion coating ... 10  8 Heat treatment after coating ... 11  9 After treatment ... 11  Annex A (Informative) Guidance information ... 12  Annex B (Informative) Recommendations for phosphate conversion coatings to provide corrosion protection ... 15  Annex C (Informative) Recommendations for phosphate conversion coatings to ensure good adhesion of paints, varnishes and related coatings and to improve corrosion resistance ... 16  Annex D (Informative) Recommendations for phosphate conversion coatings to facilitate cold forming ... 17  Annex E (Informative) Recommendations for phosphate conversion coatings to facilitate sliding action ... 18  Annex F (Informative) Guidance on the heat treatment of steel ... 19  Annex G (Informative) Appearance of types of phosphate conversion coatings ... 22  Annex H (Informative) Determination of corrosion resistance ... 23  Annex J (Informative) Identification of phosphate conversion coatings ... 25  Foreword This Standard is revised based on ISO 9717.1990 Method for specifying phosphate conversion coatings for metals. It is equivalent with the International Standard in technical content. The writing rules comply with GB/T 1.1-1993. According to the provisions and format of GB/T 1.1-1993, this Standard added the foreword and “Introduction” of ISO 9719. In the specific technical details of the Standard, it listed Clause 4 “Coating forming method” of GB 11376-89 into the annex of this Standard. It also added Clause 8 “Heat treatment after phosphating” and Clause 9 “Post-processing”. In normative references, it added GB 12609-90 Electrodeposited metallic coatings and related finishes-Sampling procedures for inspection by attributes. Since the date of implementation of this Standard, it replaces GB 11376-89 Metal phosphate conversion coating. Annex A, B, C, D, E, F, G, H, J of this Standard are informative. This Standard was proposed by Ministry of Machinery Industry of the People 's Republic of China. This Standard shall be under the jurisdiction of National Technical Committee on Metallic and Non-metallic Coatings of Standardization Administration of China. The drafting organization of this Standard. Wuhan Institute of Materials Protection, Ministry of Machinery Industry. Main drafters of this Standard. Chen Diqin, Du Wenlan. This Standard was issued in June 1989 for the first time. Phosphate conversion coatings for metals Introduction Phosphate conversion coatings are used in ferrous metals, aluminum, zinc, cadmium and their alloys. It can not only be used as the final finishing layer, but also as other layers of the middle layer. Its roles are as follows. a) enhance corrosion resistance; b) improve the adhesion between the substrate and the coating or other organic finishing layer; c) improve the cold processing properties of materials, such as drawing, drawing, extrusion, etc.; d) improve the surface friction properties to promote its sliding. The main process overview guidelines are given in Annex A (informative). See Annexes B, C, D, E (informative) for each end-use membrane and post- treatment recommendations. 1 Scope This Standard describes a method of specifying requirements for phosphate conversion coatings, intended primarily for application to ferrous metals, aluminium, zinc, cadmium and their alloys. 2 Normative references The following standards contain the provisions which, through reference in this Standard, constitute the provisions of this Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. GB/T 9792-88 Coatings on metallic materials - Determination of coating mass per unit area - Gravimetric methods (eqv ISO 3892.1980); GB 12609-90 Electrodeposited metallic coatings and related finishes - Sampling procedures for inspection by attributes (eqv ISO 4519.1980); the coating by rubbing with a rubber squeegee. Using the appropriate analytical instrument (J.2.3.1), detect which of the elements, phosphorus, manganese, zinc and calcium, are present in the test solution. J.3 Method 2 As an alternative to method 1 (clause J.2) a scanning electron microscope equipped for Energy Dispersive Spectroscopy (EDS) may be used for the direct detection of metal elements in the coating. J.4 Interpretation of results Taking account of the elements detected, identify the types of coating in accordance with Table J.1. For ferrous basis materials, the absence of manganese or zinc in the conversion coating indicates almost certainly that the coating consists of iron(II) phosphate. Table J1 Identification of phosphate conversion coating type Elements detected Coating type Phosphorus Phosphate Manganese Mnph Zinc (no calcium) Znph Zinc and calcium ZnCaph ......

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