ZINC CONTACT WITH OTHER METALS
The information provided is taken from the special publication PD6484:
1979 of the British Standards Institution entitled: “Commentary on the corrosion of bimetallic contacts and its reduction”. This guide is for the use of designers to avoid situations where corrosion can occur by bimetallic contact between various metals and their alloys in five environments, namely rural, industrial, urban, marine and immersion in freshwater and seawater.
We present, below, the data concerning the behavior of zinc and its alloys. It is of course also necessary to consult those concerning the metal coupled with zinc to verify its good behavior.
Meaning of the symbols of the table
0. Zinc and zinc alloys will not undergo additional corrosion or at most will suffer very little additional corrosion, which is generally acceptable in use.
1. Zinc and zinc alloys will experience low or moderate additional corrosion that may be tolerated in some cases.
2. Zinc and zinc alloys may experience significant additional corrosion and protective measures will usually be required.
3. Zinc and zinc alloys may experience significant additional corrosion and contact should be avoided.
Values in parentheses, based on a very limited amount of information, are less reliable than other values. The codifications in the table are expressed in terms of “additional corrosion” and the symbol 0 does not mean that metals in contact should not be protected under all conditions of exposure.
Additional corrosion of Zinc and Zinc Alloys.
(resulting from contact with other metals and carbon)
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