| Paragraph | Page | ||
|---|---|---|---|
| FOREWORD | ii | ||
| 1. SCOPE | 1 | ||
| 1.1 | Scope | 1 | |
| 1.2 | Applicability. | 1 | |
| 1.3 | Methodology | 1 | |
| 2. APPLICABLE DOCUMENTS. | 1 | ||
| 2.1 | General.. | 1 | |
| 2.2 | Government documents.. | 1 | |
| 2.2.1 | Specifications and standards | 1 | |
| 2.2.2 | Other Government documents, drawings, and publications | 2 | |
| 2.3 | Non-Government publications.. | 2 | |
| 2.4 | Order of precedence | 2 | |
| 3. DEFINITIONS | 2 | ||
| 3.1 | Acronyms used in this standard | 2 | |
| 3.2 | Cognizant Engineering Authority (CEA) | 3 | |
| 3.3 | Corrosion. | 3 | |
| 3.4 | Corrosion rate.. | 3 | |
| 3.5 | Dissimilar conductive materials | 3 | |
| 3.6 | Electrically conductive materials (conductive materials) | 3 | |
| 3.7 | Faying surface. | 3 | |
| 3.8 | Galvanic compatibility | 3 | |
| 3.9 | Galvanic corrosion.. | 4 | |
| 3.10 | Galvanic series. | 4 | |
| 4. GENERAL REQUIREMENTS.. | 4 | ||
| 5. DETAILED REQUIREMENTS | 4 | ||
| 5.1 | Galvanic compatibility | 4 | |
| 5.2 | Minimizing galvanic corrosion | 4 | |
| 5.3 | Galvanic series in artificial seawater | 5 | |
| 5.4 | Protection of galvanically incompatible materials | 5 | |
| 5.5 | Anode to cathode area ratio. | 5 | |
| 5.6 | Additive manufacturing (AM) | 6 | |
| 5.7 | Materials containing conductive components.. | 6 | |
| 5.8 | Seawater environments | 6 | |
| 5.9 | Non-metallic materials.. | 6 | |
| 5.10 | Magnesium. | 6 | |
| 5.11 | Joining methods to prevent galvanic corrosion.. | 7 | |
| 5.11.1 | Humidity controlled environments. | 7 | |
| 6. NOTES | 8 | ||
| 6.1 | Intended use.. | 8 | |
| 6.2 | Acquisition requirements. | 8 | |
| 6.3 | Subject term (key word listing). | 8 | |
| 6.4 | Changes from previous issue | 9 | |
| 6.5 | Calculation of corrosion rate | 9 | |
| 6.6 | Summary of material properties. | 9 | |
| 6.7 | Surface treatment notes in all tables | 9 | |
| CONCLUDING MATERIAL | 44 | ||
| APPENDICES | |||
| APPENDIX A SURFACE PROTECTIVE TREATMENTS. | 15 | ||
| A.1 | SCOPE | 15 | |
| A.1.1 | Scope | 15 | |
| A.1.2 | Application | 15 | |
| A.2 | APPLICABLE DOCUMENTS | 15 | |
| A.2.1 | Specifications | 15 | |
| A.2.2 | Non-Government publications | 16 | |
| A.3 | Surface preparation for protective scheme treatment. | 17 | |
| A.4 | Corrosion protection | 17 | |
| A.4.1 | Treatment for magnesium and magnesium alloys | 17 | |
| A.4.2 | Treatment for zinc and zinc coatings | 18 | |
| A.4.3 | Treatment for lead, tin, solders and indium coatings. | 18 | |
| A.4.4 | Treatment for cadmium or beryllium. | 18 | |
| A.4.5 | Treatment aluminum and aluminum alloys. | 18 | |
| A.4.6 | Treatment for carbon and low alloy steels | 19 | |
| A.4.7 | Treatment for titanium and titanium alloys. | 20 | |
| A.4.8 | Treatment for electrically conductive composites | 21 | |
| A.4.9 | Treatment for graphite. | 21 | |
| A.4.10 | Treatment for austenitic, precipitation hardening (PH), ferritic and martensitic stainless steels | 21 | |
| A.4.11 | Treatment for copper and copper alloys | 22 | |
| A.4.12 | Treatment for chromium (chrome) plating | 23 | |
| A.4.13 | Treatment for silver | 23 | |
| A.4.14 | Treatment for rhodium, palladium, gold, platinum and their alloys | 23 | |
| APPENDIX B MATERIAL PREPARATION AND ACQUISITION OF POLARIZATION DATA | 24 | ||
| B.1 | SCOPE | 24 | |
| B.1.1 | Scope | 24 | |
| B.1.2 | Application | 24 | |
| B.2 | APPLICABLE DOCUMENTS | 24 | |
| B.2.1 | Non-Government publications | 24 | |
| B.3 | GENERAL REQUIREMENTS | 24 | |
| B.3.1 | Data validation and verification | 24 | |
| B.3.2 | Surface preparation. | 25 | |
| B.3.3 | Electrochemical cell.. | 26 | |
| B.3.4 | Reference electrode | 26 | |
| B.3.5 | Reference electrode maintenance | 26 | |
| B.3.6 | Electrolyte | 27 | |
| B.3.7 | Polarization curve data acquisition. | 27 | |
| B.3.8 | Data reproducibility | 28 | |
| B.4 | Notes. | 29 | |
| B.4.1 | Exceptions to material preparation | 29 | |
| B.4.2 | O-rings. | 29 | |
| B.4.3 | Sample storage prior to testing | 29 | |
| B.4.4 | Polarization curve test parameters | 29 | |
| B.4.5 | pH variabilities. | 29 | |
| B.4.6 | OCP variabilities | 30 | |
| B.4.7 | Connection issues with potentiostat.. | 30 | |
| B.4.8 | Post-processing transformation.. | 30 | |
| B.4.8.1 | Pairing polarization data.. | 31 | |
| B.4.8.2 | Deconvolution overview | 31 | |
| B.4.8.3 | Outlier analysis | 31 | |
| B.4.8.4 | Generating an individual material polarization curve | 31 | |
| B.4.8.5 | Generating a joint sample polarization curve | 32 | |
| APPENDIX C PRINCIPLES OF GALVANIC CORROSION. .33 | |||
| C.1 | SCOPE. | 33 | |
| C.1.1 | Purpose | 33 | |
| C.1.2 | Application | 33 | |
| C.2 | GENERAL INFORMATION | 33 | |
| C.2.1 | Factors influencing galvanic corrosion | 33 | |
| C.2.2 | Corrosive environment | 33 | |
| C.2.3 | Conductivity of the galvanic circuit | 34 | |
| C.2.4 | Components of polarization curve.. | 34 | |
| C.2.5 | Mixed conductive material polarization curves. | 36 | |
| C.2.6 | Accelerating factor determination | 37 | |
| C.2.7 | Polarization control | 37 | |
| C.2.8 | Electrode areas | 38 | |
| C.2.9 | Resistance and galvanic current.. | 39 | |
| C.2.10 | The electrolyte medium.. | 39 | |
| C.2.11 | Aeration, diffusion, and agitation of solution | 39 | |
| C.2.12 | Importance of kinetics. | 39 | |
| C.2.13 | Calculating anode to cathode (A/C) ratio.. | 40 | |
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