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AS 1627.6:2025
[Current]Metal finishing - Preparation and pretreatment of surfaces, Part 6: Phosphate and chromate conversion treatment of metals
AS 1627.6:2025 specifies requirements and procedures for chemical coatings for ferrous and non-ferrous metals and for chromate conversion coatings for aluminium, magnesium, zinc and their alloys.
Published: 21/03/2025
Pages: 28
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
Introduction
1 Scope and general
1.1 Scope
1.2 Normative references
1.3 Terms and definitions
1.4 New designs and innovations
2 Phosphate conversion treatment
2.1 Scope of section
2.2 Coating classification
2.2.1 Coatings for iron and steel
2.2.2 Coatings for non-ferrous metals
2.3 Requirements for phosphate coatings
2.3.1 General
2.3.2 Coating mass
2.3.3 Freedom from corrosive residues
2.3.4 Resistance to corrosion
2.4 Methods of application
2.4.1 General
2.4.2 Surface preparation
2.4.3 Phosphate treatment
2.4.4 Rinsing
2.4.5 Staining
2.4.6 Drying
2.4.7 Treatment of creviced components
2.4.8 Treatment of composite articles
2.4.9 Treatment of high tensile steels
2.4.10 Coating
3 Chromate conversion treatment of aluminium, magnesium, zinc and their alloys
3.1 Scope of section
3.2 Coating classification
3.3 Requirements for chromate coatings
3.3.1 General
3.3.2 Test specimens and sampling
3.3.3 Coating mass
3.3.4 Adhesion
3.3.5 Corrosion resistance of chromate coating on aluminium
3.3.6 Coating identification
3.3.6.1 Colourless, yellow or brown coatings
3.3.6.2 Green coatings
3.4 Methods of application
3.4.1 Surface preparation
3.4.2 Method of application of chromate coatings
3.4.3 Rinsing and drying
Appendix A
A.1 General
A.2 Information to be supplied by the purchaser
Appendix B
B.1 General
B.2 Principle
B.3 Test specimens
B.4 Determination of coating mass on steel using the chromic acid method
B.4.1 Reagent
B.4.2 Procedure
B.4.3 Calculation of coating mass
B.5 Phosphate coatings on zinc
B.5.1 Reagent
B.5.2 Procedure
B.6 Crystalline phosphate coating on aluminium and its alloys
B.6.1 Reagent
B.6.2 Procedure
B.7 Chromate and amorphous phosphate coatings on aluminium and its alloys
B.7.1 Fresh coatings
B.7.1.1 General
B.7.2 Reagent
B.7.3 Procedure
B.8 Test report
Appendix C
C.1 General
C.2 Principle
C.3 Procedure
C.4 Test report
Appendix D
D.1 Determination of corrosion resistance of phosphate-coated ferrous metals that have not been after-treated or organically coated
D.1.1 Principle
D.1.2 Procedure
D.2 Determination of corrosion resistance of phosphate conversion coatings that have been after-treated with corrosion-preventing oils
D.2.1 Principle
D.2.2 Procedure
D.2.2.1 To evaluate a specific corrosion-protecting system
D.2.2.2 Comparative testing
D.2.3 Neutral salt spray test
D.3 Test report
Appendix E
E.1 Scope
E.2 Requirements
E.3 Embrittlement relief treatment classes
E.4 Heat treatment after processing
E.4.1 Heat treatment
E.4.2 High strength steels
E.4.3 Threads and sharp notches
E.4.4 Surface-hardened, through-hardened and bearing steels
E.4.5 Hardness loss for chromium steels
Appendix F
F.1 Scope
F.2 Test specimens
F.3 Determination of mass of fresh chromate coatings
F.3.1 Reagent
F.3.2 Procedure
F.4 Determination of mass of aged chromate coatings
F.4.1 Reagent
F.4.2 Procedure
F.5 Expression of results
F.5.1 Calculation
F.6 Test report
Appendix G
G.1 Scope
G.2 Reagents
G.3 Determination of the presence of chromium
G.4 Determination of the presence of phosphate
G.5 Determination of the presence of zinc
Appendix H
Bibliography
Cited references in this standard
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