AS 1627.6-2003

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Metal finishing — Preparation and pretreatment of surfaces, Part 6: Chemical conversion treatment of metals

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Specifies requirements and procedures for the chemical conversion treatment of metals prior to the application of suitable organic protective coating and includes phosphate conversion of ferrous and non-ferrous and chromate conversion of aluminium, magnesium, zinc and their alloys.

Header

About this publication

Preface

Foreword

1 Scope and general

1.1 Scope

1.2 Referenced documents

1.3 Definitions

1.4 Safety precautions

1.4.1 General

1.4.2 Health hazards

1.4.3 Handling solutions

1.4.4 Protective clothing

1.4.5 Ventilation

1.4.6 Respiratory protection

1.4.7 Safety signs

1.4.8 Washing facilities

1.5 Disposal of waste solutions

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 requirements

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 requirements

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

A1 General

A2 Information to be supplied by the purchaser

Appendix B

B1 General

B2 Principle

B3 Test specimens

B4 Determination of coating mass on steel using the chromic acid method

B4.1 Reagent

B4.2 Procedure

B4.3 Calculation of coating mass

B5 Phosphate coatings on zinc

B5.1 Reagent

B5.2 Procedure

B6 Crystalline phosphate coating on aluminium and its alloys

B6.1 Reagent

B6.2 Procedure

B7 Chromate and amorphous phosphate coatings on aluminium and its alloys

B7.1 Fresh coatings

B7.1.1 General

B7.2 Reagent

B7.3 Procedure

B8 Test report

Appendix C

C1 General

C2 Principle

C3 Procedure

C4 Test report

Appendix D

D1 Determination of corrosion resistance of phosphate coated ferrous metals which have not been after-treated or organically coated

D1.1 Principle

D1.2 Procedure

D2 Determination of corrosion resistance of phosphate conversion coatings which have been after-treated with corrosion-preventing oils

D2.1 Principle

D2.2 Procedure

D2.2.1 To evaluate a specific corrosion-protecting system

D2.2.2 For comparative testing

D2.3 Neutral salt spray test

D3 Test report

Appendix E

E1 Scope

E2 Requirements

E3 Embrittlement relief treatment classes

E4 Heat treatment after processing

E4.1 Heat treatment

E4.2 High strength steels

E4.3 Threads and sharp notches

E4.4 Surface-hardened, through-hardened and bearing steels.

E4.5 Hardness loss for chromium steels

Appendix F

F1 Scope

F2 Test specimens

F3 Determinaton of mass of fresh chromate coatings

F3.1 Reagent

F3.2 Procedure

F4 Determination of mass of aged chromate coatings

F4.1 Reagent

F4.2 Procedure

F5 Expression of results

F5.1 Calculation

F6 Test report

Appendix G

G1 Scope

G2 Reagents

G3 Determination of the presence of chromium

G4 Determination of the presence of phosphate

G5 Determination of the presence of zinc

Appendix H