DEFSTAN 03-41/1(2008) : 2008

Foreword
Introduction
1 Scope
2 Warning
3 Normative References
4 Abbreviations
5 Definitions
   5.2 Process Control Schedule
   5.3 Significant surface
6 Information to be Supplied by the Purchaser
7 Process Control
8 Process Requirements
   8.1 Preceding Electrodeposition Process
       8.1.3 Post-electrodeposition heat treatment
   8.2 The trivalent chromium passivation process
       8.2.3 Process sequence
       8.2.4 Coating thickness
       8.2.5 Post-passivation supplementary treatments
9 Inspection and Test
   9.1 Visual inspection
   9.2 Salt spray test
   9.3 Torque/tension test
10 Compliance
Annex A - Guidance on Trivalent Chromium Passivation
          of Zinc-Base Electrodeposits
   A.1 Comments on the Traditional Hexavalent Chromium
       Passivation Process
       A.1.1 Basic features
       A.1.2 Health and safety issues
   A.2 Trivalent-Chromium Passivates for Zinc-Base
       Electrodeposits
       A.2.2 The corrosion protection mechanism
       A.2.3 The trivalent-chromium process
             A.2.3.1 Basic Process features
             A.2.3.2 Process temperature
             A.2.3.3 Control of zinc and iron content of
                     passivation solution
             A.2.3.4 Rinsing
       A.2.4 Sealers/Topcoats
             A.2.4.1 Sealers
             A.2.4.2 Other protective topcoats
             A.2.4.3 Torque-tension modifiers
       A.2.5 Visual Appearance of Trivalent Chromium Passivates
       A.2.6 Applicator Considerations and Process Validation
Annex B - Trivalent-Chromium Passivation Process
   B.1 General
   B.2 Passivation Conditions
   B.3 Other Aspects of Process Control
       B.3.1 Drying
       B.3.2 Agitation
   B.4 The Analysis of the Passivation Solution

Provides guidance and specifies the requirements for the passivation, using trivalentchromium solutions, of electrodeposited zinc- and zinc-alloy coatings for the provision of enhanced corrosion resistance to steel components.