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GB/T 11376-1997 English PDF (GBT11376-1997)

GB/T 11376-1997 English PDF (GBT11376-1997)

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GB/T 11376-1997: Phosphate conversion coatings for metals

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.
GB/T 11376-1997
GB
NATIONAL STANDARD OF
THE PEOPLE 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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