Abstract
Summary Laser consolidation of platinum coatings electrodeposited from molten cyanide electrolytes has been studied. Laser processing was investigated as a means of consolidating platinum coatings on molybdenum substrates. Direct current deposited platinum coatings were coated with platinum black to enhance laser coupling. The platinum coatings were then melted with a Nd-YAG laser. An electrochemical technique was used to evaluate the corrosion resistance of the processed samples in a 1 N HNO 3 environment. Results indicated that laser processing could produce a pore-free platinum coating. Using a particle occlusion technique followed by heat treatment, thick coatings of stainless steel were produced. Chromium particles (averaging 3 μ m in diameter) were suspended in a ferrous-nickelous sulfate electrolyte and occluded in the electrodeposited Fe-Ne matrix. Subsequent heat treatment at 1100 °C produced the ternary alloy. Corrosion rates equivalent to those for bulk stainless steel were measured when the ternary alloy coatings were tested in a boiling nitric acid solution.
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