Galvanic Corrosion Chart Page 2


Red Brass
Stainless steel 347 (active)
Copper-nickel 715
Admiralty brass
Stainless steel 202 (active)
Bronze, Phosphor
Monel 400
Stainless steel 201 (active)
Stainless steel 321 (active)
Stainless steel 316 (active)
Stainless steel 309 (active)
Stainless steel 17-7PH (passive)
Silicone Bronze 655
Stainless steel 301,304,321 (passive)
Stainless steel 201,286 (passive)
Stainless steel 316L (passive)
Stainless steel 202 (passive)
Noble (Cathodic) Least Likely To Corrode
Galvanic Compatibility
Often when design requires that dissimilar metals come in contact, the galvanic compatibility is
managed by finishes and plating. The finishing and plating selected facilitate the dissimilar materials
being in contact and protect the base materials from corrosion.
• For harsh environments, such as outdoors, high humidity, and salt environments fall into this category.
Typically there should be not more than 0.15 V difference in the "Anodic Index". For example; silver -
nickel would have a difference of 0.15V being acceptable.
• For normal environments, such as storage in warehouses or non-temperature and humidity controlled
environments. Typically there should not be more than 0.25 V difference in the
"Anodic Index".
• For controlled environments, such that are temperature and humidity controlled, 0.50 V can be
tolerated. Caution should be maintained when deciding for this application as humidity and
temperature do vary from regions.


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