Standard
Track updates
AS 4036-2006
[Current]Corrosion of metals — Dissimilar metals in contact in seawater
Specifies a method for testing dissimilar metal couples immersed under standard conditions in seawater and for the determination of ratings for the additional corrosion which may occur on the more anodic metal for each couple. In addition, ratings are given for 245 commercially-significant dissimilar metal couples.
Published: 17/10/2006
Pages: 28
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
Foreword
1 Scope and general
1.1 Scope
1.2 Referenced documents
1.3 Definitions
2 Factors influencing galvanic corrosion
2.1 Scope of section
2.2 Potential difference between dissimilar metals
2.3 Nature of the electrolyte
2.4 Defects in metallic coatings
2.4.1 General
2.4.2 Cathodic/anode area relationship
2.4.3 Cathodic coatings
2.4.4 Anodic coatings
2.5 Noble (cathodic) metal ion contamination
2.6 Carbonaceous materials
2.7 Movement of electrolyte
2.8 Nature of cathode reactions
2.9 Polarity reversal
2.10 Temperature
3 Control of galvanic corrosion
3.1 Scope of section
3.2 Features of design
3.3 Insulation
3.4 Cathodic protection
3.5 Coatings
3.5.1 Metallic coatings
3.5.2 Non-metallic coatings
3.6 Passivation of the metal surface
3.7 Inhibitors
Appendix A
A1 Scope
A2 Principle
A3 Apparatus
A3.1 Zero resistance ammeter (ZRA)
A3.2 High impedance voltmeter
A3.3 Test cell holder
A3.4 Reference electrode
A3.5 Glassware
A4 Reagents
A4.1 General
A4.2 Sodium chloride
A4.3 Sodium sulfate (anhydrous)
A4.4 Stock Solution No. 1
A4.5 Stock Solution No. 2
A4.6 Sodium hydroxide solution
A5 Preparation of artificial seawater
A6 Sample preparation—Type 1 (cylindrical)
A6.1 General
A6.2 Sample size
A6.3 Machining the sample
A6.4 Electrical connection
A6.5 Sample mount
A6.6 Sample assembly
A6.7 Grinding and polishing
A7 Sample preparation—Type 2 (sheet)
A7.1 General
A7.2 Electrical connection
A7.3 Sealing
A7.4 Sample assembly
A8 Preparation for test
A9 Test procedure
A9.1 General
A9.2 Procedure
A10 Method of determination of code for the rating of test results
A11 Test report
A12 Significance of test results
Appendix B
B1 Scope
B2 Code for rating dissimilar metals
B3 Corrosion resistance of dissimilar metals in contact when immersed in seawater
Appendix C
C1 Scope
C2 Corrosion process
C3 Corrosion cells
C4 Galvanic series for metals and alloys immersed in seawater based on corrosion potential measurements
Cited references in this standard
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