AS 2453-1981

1 - AS 2453-1981 ELECTROPLATED COATINGS OF CHROMIUM FOR ENGINEERING APPLICATION
4 - PREFACE
4 - CONTENTS
5 - 1 SCOPE.
5 - 2 DEFINITIONS.
5 - 2.1 Surface
5 - 2.2 Significant surface
5 - 2.3 Undercoat
5 - 2.4 Finished state
5 - 2.5 Inspection batch
5 - 3 CONDITION OF THE ITEM BEFORE ELECTROPLATING.
5 - 3.1 Surface Finish.
5 - 3.2 Preplating Condition.
5 - 4 CLASSIFICATION.
5 - 5 COATING REQUIREMENTS.
5 - 5.1 General.
6 - 5.2 Appearance.
6 - 5.3 Partially Coated Surfaces.
6 - 5.4 Coating Thickness.
6 - 5.5 Adhesion.
7 - 5.6 Hardness.
7 - 5.7 Porosity of Porous Chromium.
7 - 6 SEPARATE SPECIMENS.
7 - 7 HEAT TREATMENT AFTER ELECTROPLATING.
7 - 7.1 General.
7 - 7.2 Steels.
7 - 7.3 Aluminium and Aluminium Alloys.
8 - APPENDIX A - SUPPLEMENTARY INFORMATION TO BE SUPPLIED WITH THE ENQUIRY OR ORDER
8 - A1 GENERAL.
8 - A2 SUPPLEMENTARY INFORMATION.
8 - A3 SHOT-PEENING.
8 - A4 THICKNESS OF COATING AND USE OF UNDERCOATS.
8 - A4.1 General.
9 - A4.2 Undercoats.
9 - A4.3 Finishing to Size.
9 - A5 SAMPLING AND INSPECTION.
10 - APPENDIX B - RECLAMATION OF WORN CHROMIUM ELECTROPLATED ITEMS AND OF ITEMS ELECTROPLATED WITH INSUFFICIENT CHROMIUM
11 - APPENDIX C - POROSITY TYPES

Applies to electroplated coatings of hard chromium on ferrous and non-ferrous metals, classified in five types of regular, crack-free and porous type coatings. Heat treatment procedures are included. Information to be supplied with the enquiry or order and information on the appropriate chromium thickness to specify for different applications are given in the appendices. Photomicrographs showing the different types and percentages of porosity are included for reference standards.

This standard specifies requirements for electroplated coatings of hard chromium on ferrous and non-ferrous metals for engineering applications.NOTE: Guidelines to purchasers on requirements that must be specified by the purchaser and those that must be agreed at the time of enquiry and/or order are given in Appendix A.