The zinc alloy deposits were developed to provide improved corrosion protection over and above what can be expected from conventional zinc deposits, or in the case of tin-zinc to provide improved conductivity. The specifications published by some of the automotive manufacturers prove to be good sources of information concerning the expectations for the alloys. In addition, specifications for corrosion testing, torque and tension issues, and hydrogen embrittlement have been examined. The properties that designers look for include appearance, corrosion protection, good thickness distribution over the part, and in some cases hydrogen embrittlement relief and lubricity. Processes are both acid and alkaline because each process type has certain advantages. The acid processes are more efficient, but then distribution suffers somewhat. The alkaline processes are less efficient, and as a result, exhibit better distribution. Acid processes are easier to use when the parts are made of cast iron or when parts have been hardened by heat treatment.
Zinc alloy plating for the automotive industry
Galvanische Zinklegierungen für die Automobilindustrie
Metal Finishing ; 94 , 9 ; 54-58
1996
4 Seiten, 10 Tabellen, 16 Quellen
Article (Journal)
English
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