AS 1627.5-1994

1 - AS 1627.5-1994 METAL FINISHING - PREPARATION AND PRETREATMENT OF SURFACES - PICKLING, DESCALING AND OXIDE REMOVAL
4 - PREFACE
5 - CONTENTS
6 - FOREWORD
7 - SECTION 1 SCOPE AND GENERAL
7 - 1.1 SCOPE
7 - 1.2 REFERENCED DOCUMENTS
8 - 1.3 DEFINITIONS
8 - 1.3.1 Alkaline descaling
8 - 1.3.2 Electrolytic descaling
8 - 1.3.3 Hydrogen embrittlement
8 - 1.3.4 Inhibitor
8 - 1.3.5 Pickling
8 - 1.3.6 Scale
8 - 1.3.7 Smut
8 - 1.4 SURFACE CONDITION REQUIREMENTS AFTER TREATMENT
8 - 1.4.1 General
8 - 1.4.2 Removal of smut deposits
8 - 1.5 SAFETY PRECAUTIONS
8 - 1.5.1 General
8 - 1.5.2 Health hazards
8 - 1.5.3 Handling solutions
9 - 1.5.4 Protective clothing
9 - 1.5.5 Ventilation
9 - 1.5.6 Respiratory protection
9 - 1.5.7 Safety signs
9 - 1.5.8 Washing facilities
9 - 1.6 DISPOSAL OF WASTE SOLUTIONS
10 - SECTION 2 PROCEDURES
10 - 2.1 GENERAL
10 - 2.2 EQUIPMENT
10 - 2.3 PICKLING AND DESCALING METHODS FOR FERROUS MATERIALS
10 - 2.3.1 Preliminary cleaning
10 - 2.3.2 Pickling of low carbon steel
10 - 2.3.3 Pickling of cast iron and cast steel
10 - 2.3.4 Pickling of stainless steel
11 - 2.4 CLEANING AND OXIDE REMOVAL FROM ALUMINIUM AND ALUMINIUM ALLOYS
11 - 2.4.1 General
12 - 2.4.2 Alloy limitations
12 - 2.4.3 Preliminary cleaning
12 - 2.4.4 Scale and oxide removal
12 - 2.4.5 Rinsing
12 - 2.5 CLEANING AND OXIDE REMOVAL FROM COPPER AND COPPER ALLOYS
12 - 2.5.1 General
13 - 2.5.2 Preliminary cleaning
13 - 2.5.3 Scale and oxide removal
13 - 2.5.4 Rinsing
13 - 2.6 CLEANING AND OXIDE REMOVAL FROM ZINC AND ZINC ALLOYS
13 - 2.6.1 General
14 - 2.6.2 Preliminary cleaning
14 - 2.6.3 Scale and oxide removal
14 - 2.6.4 Rinsing
14 - 2.7 CLEANING AND OXIDE REMOVAL FROM NICKEL AND NICKEL ALLOYS
14 - 2.7.1 General
14 - 2.7.2 Preliminary cleaning
14 - 2.7.3 Final electrocleaning
15 - 2.7.4 Activation
15 - 2.8 RINSING AND DRYING
15 - 2.8.1 Draining
15 - 2.8.2 Rinsing
15 - 2.8.3 Rinse additives
15 - 2.8.4 Drying
16 - 2.9 FINAL CLEANING
16 - 2.10 CORROSION PROTECTION
17 - APPENDIX A - PURCHASING GUIDELINES
17 - A1 GENERAL
17 - A2 INFORMATION TO BE SUPPLIED BY THE PURCHASER
18 - APPENDIX B - WET SMUT TEST
18 - B1 SCOPE
18 - B2 PRINCIPLE
18 - B3 MATERIALS
18 - B4 PROCEDURE
18 - B5 INTERPRETATION
18 - B6 TEST REPORT
19 - APPENDIX C - ADVICE ON HEAT TREATMENT OF STEEL FOR RELIEF OF HYDROGEN EMBRITTLEMENT AND STRESS
19 - C1 INTRODUCTION
19 - C2 APPLICATION
19 - C2.1 Preplating heat treatment
19 - C2.2 Post-plating heat treatment
20 - C3 HEAT TREATMENT PROCEDURE
20 - C3.1 Before electroplating
20 - C3.2 After electroplating

Specifies procedures for the pickling, descaling and oxide removal for both ferrous and non-ferrous metals and alloys using acid or alkaline solutions. It gives advice on preliminary cleaning, rinsing and drying procedures, and requirements for safety precautions and for the surface condition after treatment.

This Standard sets out procedures for preparing metal surfaces by immersion, or by other means, employing chemical solutions to remove oxidation products (scale), corrosion products and related foreign materials.It includes acid pickling and alkaline descaling methods for the following materials:(a) Steels.(b) Cast iron.(c) Aluminium and aluminium alloys.(d) Copper and copper alloys.(e) Zinc and zinc alloys.(f) Nickel and nickel alloys.NOTE: Advice and recommendations on information to be supplied by the purchaser at the time of enquiry or order are contained in Appendix A.

First published as AS CK9.5-1965.
Revised and redesignated AS 1627.5-1975.
Second edition 1994.