MIL-STD-889D, Standard Practice for Galvanic Compatibility of Electrically Conductive Materials
Last Updated 29 Oct 2026
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8 tables appear under this heading.
1. PDF page 16
Cathodic Material
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
Anodic Material
1. Mg EV31
5
6
6
6
6
6
6
6
5
6
6
6
6
6
6
6
6
6
6
6
6
5
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
2. Mg WE43
6
6
6
6
6
6
6
5
6
6
6
6
6
6
6
6
6
6
6
6
5
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
3. Mg AZ31B
5
6
6
6
5
5
5
6
6
6
6
6
6
6
6
6
6
6
6
5
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
4. Zinc
5
3
5
3
4
3
5
5
5
6
6
3
6
5
6
5
5
4
4
5
5
5
5
5
6
5
5
5
5
5
5
5
5
5
5
5
5
5
5
3
6
6
5. Zn-Ni Plated
3
5
3
4
4
5
5
5
5
5
4
5
5
5
5
4
4
4
5
5
5
5
5
6
4
5
5
5
5
5
5
5
5
5
5
5
5
5
4
5
6
6. Al5083
3
2
2
2
3
4
5
5
5
2
4
3
4
3
2
3
2
4
4
4
4
4
5
3
5
4
4
3
3
4
5
4
3
4
4
3
4
3
3
5
5
7. Cadmium
4
5
4
5
5
5
5
5
4
5
5
5
5
5
5
4
5
5
5
5
5
6
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
6
5
8. Al6061
2
2
3
4
5
5
5
2
4
3
4
3
2
3
2
4
4
4
4
4
5
3
5
4
4
3
3
4
5
4
3
4
4
3
4
3
3
5
5
9. CP Aluminum
2
3
4
5
5
5
2
4
3
4
3
2
3
2
4
4
4
4
4
5
3
5
4
4
3
3
4
5
4
3
4
4
3
4
3
3
5
5
10. A356
3
4
5
5
5
2
4
3
4
3
2
3
2
4
4
4
4
4
4
3
5
4
4
3
3
4
5
4
3
4
4
3
4
3
3
5
4
11. 1020 Steel
4
5
5
5
3
4
4
4
4
3
3
3
4
4
4
4
4
5
3
4
4
4
3
3
4
4
4
3
4
4
3
4
3
3
5
4
12. Al7075
5
5
5
4
5
5
5
5
4
5
4
5
5
5
5
5
5
5
5
5
5
4
5
5
5
5
5
5
5
5
5
5
4
5
5
13. A36 Steel
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
14. 1018 Steel
5
4
5
5
5
5
4
5
4
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
15. 1008 Steel
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
16. Al7050
4
3
4
3
2
3
2
4
4
4
4
4
5
3
5
4
4
3
3
5
5
4
3
4
4
3
4
3
3
5
5
17. B7 Steel
4
4
4
3
4
3
4
4
4
4
4
5
4
4
4
4
3
4
4
5
4
4
4
4
4
4
3
5
4
18. MIL-11356 Steel
4
3
3
3
3
4
4
3
3
4
4
3
4
4
4
3
3
4
4
4
3
3
4
3
3
3
3
5
4
19. 4340 Steel
4
3
3
3
4
4
4
4
4
4
4
4
4
4
3
4
4
4
4
3
4
4
4
4
3
5
4
20. HY80 Steel
3
3
3
4
4
4
4
4
4
3
4
4
4
3
4
4
4
4
3
4
4
4
4
3
5
4
21. Tin
3
1
4
4
4
4
4
2
3
3
3
3
2
2
3
3
3
2
3
3
3
2
3
5
5
22. Al2024
3
4
4
4
4
4
3
3
5
4
4
3
4
4
5
4
3
4
4
4
3
3
5
5
23. Ti-6Al-4V
3
2
3
2
3
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
2
24. Brass, Yellow
4
4
4
4
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
4
5
25. Bronze
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
4
26. NiAl, C630
3
4
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
4
5
27. CuBe
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
4
28. CP Copper
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
4
29. PH 13-8
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
30. 304SS
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
31. PH 15-5
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
32. 304SS Passivated
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
33. 410SS
0
0
0
0
0
0
0
0
0
0
0
0
0
1
34. Inconel ® 600
0
0
0
0
0
0
0
0
0
0
0
1
1
35. A286 Passivated
0
0
0
0
0
0
0
0
0
0
0
1
36. PH 17-4
0
0
0
0
0
0
0
0
0
0
1
37. 316SS
0
0
0
0
0
0
0
0
0
1
38. 316SS Passivated
0
0
0
0
0
0
0
0
1
39. Monel ® 400
0
0
0
0
0
0
1
1
40. 410SS Passivated
0
0
0
0
0
0
1
41. A286
0
0
0
0
0
1
42. PH 17-4 Passivated
0
0
0
0
1
43. PH 13-8 Passivated
0
0
0
1
44. PH 15-5 Passivated
0
0
0
45. Silver
1
3
46. Graphite
1
2. PDF page 17
Cathodic Material
a
b
c
d
e
f
g
h
i
j
k
l
m
n
Anodic Material
a. Mg WE43 T*
5
5
5
5
6
5
5
5
5
6
5
5
6
b. Mg EV31 T*
4
5
5
6
5
5
5
5
6
5
5
6
c. Mg AZ31B T*
5
4
5
5
5
5
4
6
5
5
6
d. Al5083 Cr+6
2
2
2
2
2
2
2
2
2
3
e. Al6061 Cr+6
2
2
2
2
2
2
2
2
3
f. Al5083 Cr3+
2
2
2
2
2
2
2
2
g. Al7075 Cr6+
2
2
2
2
2
2
4
h. Al6061 Cr+3
2
2
2
2
3
3
i. Cadmium w CC
1
2
3
3
4
j. Al7075 Cr+3
2
2
2
4
k. Zn-Ni w CC
3
3
4
l. Al2024 Cr6+
2
3
m. Al2024 Cr3+
3
n. Electroless Ni
3. PDF page 18
a. Mg WE43 T*
b. Mg EV31 T*
c. Mg AZ31B T*
d. Al5083 Cr+6
e. Al6061 Cr+6
f. Al5083 Cr3+
g. Al7075 Cr6+
h. Al6061 Cr+3
i. Cadmium w CC
j. Al7075 Cr+3
k. Zn-Ni w CC
l. Al2024 Cr6+
m. Al2024 Cr3+
n. Electroless Ni
1. Mg EV31
5
5
5
6
6
6
6
6
6
6
6
6
6
2. Mg WE43
5
5
5
6
6
6
6
6
6
6
6
6
6
3. Mg AZ31B
5
5
5
5
5
6
5
5
5
5
6
5
5
6
4. Zinc
5
5
5
2
2
2
3
3
4
2
4
3
3
5
5. Zn-Ni Plated
6
6
6
3
3
3
3
3
3
3
4
4
4
5
6. Al5083
6
6
5
2
2
2
2
2
2
1
2
2
3
4
7. Cadmium
6
6
6
3
3
3
3
3
4
4
5
5
5
5
8. Al6061
5
5
4
2
2
2
2
2
2
1
2
2
2
3
9. CP Aluminum
5
5
5
2
2
2
2
2
3
2
3
3
3
4
10. A356
5
5
4
2
2
2
2
2
2
2
2
2
2
3
11. 1020 Steel
6
6
6
3
3
3
3
3
4
3
3
3
3
3
12. Al7075
6
6
6
4
4
4
4
4
5
4
4
4
4
5
13. A36 Steel
6
6
6
5
5
5
5
5
5
5
5
5
5
5
14. 1018 Steel
6
6
6
5
5
5
5
5
5
5
5
5
5
5
15. 1008 Steel
6
6
6
5
5
5
5
5
5
5
5
5
5
5
16. Al7050
6
6
5
2
2
2
2
2
2
2
2
2
3
4
17. B7 Steel
6
6
6
4
4
4
4
4
5
4
4
3
3
4
18. MIL-11356 Steel
6
6
6
3
3
3
3
3
4
3
3
3
3
3
19. 4340 Steel
6
6
6
4
4
4
4
4
5
4
4
3
3
4
20. HY80 Steel
6
6
6
3
3
3
3
3
4
3
4
3
3
4
21. Tin
6
6
5
2
2
2
2
2
2
1
2
1
1
2
22. Al2024
6
6
6
3
3
3
3
3
4
3
3
3
3
4
23. Ti-6Al-4V
5
5
5
2
2
2
2
2
2
1
2
1
1
1
24. Brass, Yellow
6
6
6
4
4
3
4
4
5
4
4
4
4
3
25. Bronze
6
6
6
4
4
3
4
4
5
4
4
4
4
3
26. NiAl, C630
6
6
6
4
4
3
4
4
5
4
4
4
4
3
27. CuBe
6
6
6
4
4
3
4
4
5
4
4
4
4
3
28. CP Copper
6
6
6
4
4
3
4
4
5
4
5
4
4
3
29. PH 13-8
6
6
6
4
4
2
3
4
5
4
5
2
2
2
30. 304SS
6
6
6
3
3
2
3
3
4
3
3
3
3
2
31. PH 15-5
6
6
6
5
4
2
5
5
5
5
5
4
4
2
32. 304SS Passivated
6
6
6
4
4
2
4
4
5
4
5
4
4
2
33. 410SS
6
6
6
4
4
2
4
4
5
4
5
4
4
2
34. Inconel® 600
6
6
6
3
3
2
3
3
3
3
3
3
2
2
35. A286 Passivated
6
6
6
3
3
2
3
3
4
3
4
3
3
2
36. PH 17-4
6
6
6
4
4
2
4
4
5
4
5
4
3
2
37. 316SS
6
6
6
5
5
2
5
5
5
5
5
5
4
2
38. 316SS Passivated
6
6
6
4
4
2
4
4
5
4
4
4
3
2
39. Monel® 400
6
6
6
3
3
2
3
3
4
3
3
2
2
2
40. 410SS Passivated
6
6
6
4
4
2
4
4
5
4
4
3
3
2
41. A286
6
6
6
4
4
2
4
4
5
4
4
4
3
2
42. PH 17-4 Passivated
6
6
6
3
3
2
3
3
4
3
4
3
3
2
43. PH 13-8 Passivated
6
6
6
4
4
2
4
4
5
4
4
3
3
2
44. PH 15-5 Passivated
6
6
6
3
3
2
3
3
4
3
4
3
3
2
45. Silver
6
6
5
3
3
2
3
3
3
3
3
3
3
2
46. Graphite
6
6
6
5
5
2
5
5
5
5
5
5
5
2
47. Platnium
6
6
6
4
4
2
4
4
5
5
5
4
4
3
4. PDF page 19
Active (More Active - Anodic)
Magnesium WE-43 Tagnite
Tin
Magnesium EV-31
Al2024
Magnesium EV-31 Tagnite
Al2024 Cr+6
Magnesium WE-43
Al2024 Cr+3
Magnesium AZ31-B Tagnite
Ti-6Al-4V
Magnesium AZ31-B
Electroless Nickel
Al5083 Cr+6
Brass, Yellow
Zinc
Bronze
Al6061 Cr+6
NiAl Alloy C630
Al5083 Cr+3
CuBe
Al7075 Cr+6
Copper
Zn-Ni Plated
PH 13-8
Al6061 Cr+3
304SS
Al5083
PH 15-5
Cadmium
Passivated 304SS
Al6061
410SS
Cadmium w/ Conversion Coating
Inconel® 600
Aluminum
Passivated A286
Al7075 Cr+3
PH 17-4
A356
316SS
1020 Steel
316SS Passivated
Al7075
Monel® 400
Zn-Ni with Conversion Coating
410SS Passivated
A36 Steel
A286
1018 Steel
PH 17-4 Passivated
1008 Steel
PH 13-8 Passivated
Al7050
PH 15-5 Passivated
B7 Steel
Silver
MIL-11356 Steel
Graphite
4340 Steel
Platinum
HY80 Steel
Continued in column 2…
Noble (Less Active - Cathodic)
MIL-STD-889D Nomenclature
UNS Code
Properties
Characteristic Tested in MIL-STD-889D
A356
A13560
Bare
CP Aluminum
A91100
Bare
Al2024
A92024
Heat Treat: T-3; SAE AMS4037
Bare, Cr⁶⁺, Cr³⁺
Al5083
A95083
Alloy H-32
Bare, Cr⁶⁺, Cr³⁺
Al6061
A96061
Heat Treat: T-6
Bare, Cr⁶⁺, Cr³⁺
Al7050
A97050
Bare
Al7075
A97075
Heat Treat: T-6
Bare, Cr⁶⁺, Cr³⁺
CP Copper
C10100
Bare
CuBe
C17000
Bare
Bronze
C22000
Commercial Bronze C-220
Bare
Brass, Yellow
C26800
Alloy CA-260; ASTM B36/B36M
Bare
NiAl C630
C63000
Bare
1008 Steel
G10080
Bare
1018 Steel
G10180
Bare
1020 Steel
G10200
SAE 1020, Cold-rolled
Bare
B7 Steel
G41400
Bare
4340 Steel
G43400
AISI 4340
Bare
MIL11356 Steel
J13025
Bare
HY80 Steel
J42015
Bare
A36 Steel
K02600
Bare
Cadmium
L01951
SAE AMS-QQ-P-416
Bare, Conversion Coated
Mg AZ31
M11311
Bare, Tagnite
Mg EV31
M12310
Bare, Tagnite
Mg WE43
M18430
Bare, Tagnite
Monel® 400
N04400
Alloy 400
Bare
Inconel® 600
N06600
Alloy 600
Bare
Platinum
P04995
Bare
Silver
P07010
Bare
Ti-6Al-4V
R56400
SAE AMS-T-9046, Composition C, Type III
Bare
PH 13-8
S13800
SAE AMS5629D; Heat treat: solution treated
Bare, Passivated
PH 15-5
S15500
Bare, Passivated
PH 17-4
S15700
ASTM A693-06 Type 630
Bare, Passivated
304SS
S30400
Bare, Passivated
316SS
S31600
AISI 316
Bare, Passivated
410SS
S41000
Bare, Passivated
A286
S66286
SAE AMS5525K Cold Rolled, Annealed
Bare, Passivated
Zinc
Z15006
Bare
Graphite
NA
Bare
Tin
NA
ASTM B339A(b)
Bare
Zn-Ni Plated
NA
ASTM B841
Bare, Conversion Coated
5. PDF page 32
Reference Electrode
Potential (V vs. ESHE)
Potential (V vs. SCE)
Standard Hydrogen Electrode
0.00
-0.241
Ag/AgCl, saturated KCl
+0.199
-0.042
Saturate Calomel Electrode
+0.241
0.00
Copper Sulfate, saturated
+0.318
+0.077
6. PDF page 34
Item
Notes
Equipment
Electrochemical cell.
Reference electrode
SCE, Ag/AgCl, or other suitable electrode.
Electrolyte
Artificial sea water per ASTM D1141 without heavy metals, 25 ± 1.67 °C (77 ± 3 °F), pH 8.2 ± 0.02, vigorously aerated (10-20 minutes) prior to testing, then quiescent condition (naturally aerated; no bubbling)
Working electrode
Specimen to be tested. Stationary. Abraded with appropriate P800 or ANSI 400 grinding paper, cleaned with acetone then ethanol, and surface treated appropriately (if required).
OCP stabilization
The surface should be stabilized in the electrolyte, but not for a time that causes the surface condition to change significantly (e.g. crevice or pitting):
MORE Noble (OCP > -200 mV vs. SCE):
LESS Noble (OCP < -200 mV vs. SCE):
24 hours in electrolyte prior to polarization measurement
4 hours in electrolyte prior to polarization measurement
Polarization curve
- Anodic polarization: OCP to +0.7 V vs. OCP, or when the anodic current density reaches a maximum current of 10 mA/cm² - Cathodic polarization: OCP to -1.4 V vs. SCE, or when the cathodic current density reaches a maximum current of 10 mA/cm² Note: Cathodic and anodic curves shall be obtained on separate specimens prepared according to B.3.2.
Sweep rate
100 µV/s for entire potential range
IR correction
The reference electrode should be placed >2x diameter of Luggin tip from the working electrode.
7. PDF page 36
Potential Causes
Solution
Air bubbles in the Luggin tube or bridge cell
Gentle tapping or a piece of thin tubing inserted into Luggin Tube/bridge cell
Corrosion on metallic connectors (on alligator clips, banana clips, connection plates, etc.)
Replace connectors or remove corrosion from the metallic connectors
Poor metallic-metallic interface between connection plate and sample (e.g., material from a mask causing a gap and poor interface with the connection plate)
Etch material where the connector is attached or remove mask from that area of the connector.