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The durability of decorative nickel-iron coatings in various types of exposure is discussed in detail. It has been determined that these coatings, as part of a specific multiple deposit system, perform acceptably for exterior automotive applications. It is necessary that a microdiscontinuous chromium be present in the composite coating to achieve optimum results and it is desirable to use a copper underlayer to the nickel-iron electrodeposits. Corrosion test results are also reported which establish that static tests cannot be relied upon to predict actual mobile service performance.
bright nickel-iron alloy, exterior automotive, static tests, mobile tests, duplex alloy coatings, microdiscontinuous chromium, copper underlayer deposits, multiple deposits, staining
Manager, Research & Development, Udylite, Plating Systems Division, Hooker Chemical and Plastics Corp., Warren, Mich.