PROCESSING-PLATING SYSTEMS-UNCLAD 2020 ALUMINUM ALLOY-CHEMICAL AND PHYSICAL PROPERTIES-EVALUATION OF
GENERAL DYNAMICS CORP FORT WORTH TX
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Studies were made to evaluate the plating methods and plate properties of various plating systems for unclad X-2020 Al alloy exposed to elevated and room temperature heat soak treatments. Specimens of X-2020 Al alloy were plated by procedures employing 1 no pretreatment of basis metal and 2 sodium zincate pretreatment of basis metal. The specimens were plated with Cr and Sn by standard electrolytic methods and with electroless Ni by the Alkaline type, modified Hydrac type, and Dow Process type baths. Plated specimens were then exposed to 100-hr heat soak performance tests at temperatures up to 350 F and subsequently evaluated for plating adhesion and corrosion resistance. Visual observations and tape stripping test results revealed that the platings applied to X-2020 aluminum by the direct method no pretreatment exhibited extremely poor adhesion.
- Properties of Metals and Alloys
- Coatings, Colorants and Finishes