MIL-STD-889D-2021 Department Of Defense Standard Practice Galvanic Compatibility Of Electrically Conductive Materials

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MIL-STD-889D

21 July 2021

SUPERSEDING

MIL-STD-889C

22 August 2016

DEPARTMENT OF DEFENSE

STANDARD PRACTICE

GALVANIC COMPATIBILITY OF ELECTRICALLY

CONDUCTIVE MATERIALS

AMSC N/A AREA MFFP

NOT MEASUREMENT

SENSITIVE

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MIL-STD-889D

FOREWORD

1. This standard is approved for use by all Departments and Agencies of the Department of

Defense.

2. Comments, suggestions, or questions on this document should be addressed to

Commanding Officer, Naval Air Warfare Center Aircraft Division Lakehurst, System

Standardization and PHS&T Branch, Code BL32600, Mail Stop 120-3, Route 547, Joint

Base MDL, NJ 08733-5100 or emailed to LKE-NAVAIRDocComments@navy.mil.

Since contact information can change, you may want to verify the currency of this

address information using the ASSIST online database at https://assist.dla.mil.

3. Previously, MIL-STD-889 used the galvanic potential difference between conductive

material couples to determine compatibility between dissimilar metals. In revision D,

the corrosion rate of the anodic member of the galvanic couple is used to determine

galvanic compatibility. This new methodology is based on the mixed potential theory of

electrochemistry, which states that the common potential reached by two dissimilar

materials in electrical contact, and the galvanic current between them, is determined by

the crossing points of their polarization curves. We determined that summing the two

curves together to form a joint polarization curve, and then crossing the anodic and

cathodic side to determine the galvanic current and galvanic potential satisfied the wide

range of polarization curves we collected. The measured galvanic current is then used to

calculate the galvanic corrosion rate of the anodic member of a dissimilar couple. This

standard establishes the new requirements for galvanic compatibility of dissimilar

electrically conductive materials and outlines the procedures required to generate

electrochemical data to analyze new materials, coatings, and surface treatments.

4. For guidance on the technical content of this document, contact Commander, Naval Air

Warfare Center, Aircraft Division, (Materials Engineering Division – AB23000), 48066

Shaw Road, 2188 Patuxent River, MD 20670.

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MIL-STD-889D

iii

TABLE OF CONTENTS

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

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This document provides a comprehensive SEO-optimized overview of MIL-STD-889D-2021, the Department of Defense Standard Practice for Galvanic Compatibility of Electrically Conductive Materials. It outlines critical guidelines for assessing and prevent

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MIL-STD-889D-2021 Department Of Defense Standard Practice Galvanic Compatibility Of Electrically Conductive Materials

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