Patent ID: 8524053

Claim:
An apparatus for producing a graded corrosion-resistant amorphous-metal coating on a structure, comprising: a deposition chamber, a deposition system in said deposition chamber that produces two deposition sprays, wherein said two deposition sprays include a first amorphous metal and a second amorphous metal, wherein said first amorphous metal is a composite material made of amorphous metal that contains manganese (1 to 3 atomic %), yttrium (0.1 to 10 atomic %), and silicon (0.3 to 3.1 atomic %) in the range of composition given in parentheses; and that contains the following elements in the specified range of composition given in parentheses: chromium (15 to 20 atomic %), molybdenum (2 to 15 atomic %), tungsten (1 to 3 atomic %), boron (5 to 16 atomic %), carbon (3 to 16 atomic %), and the balance iron; and wherein said second amorphous metal is an amorphous metal that is different from said first amorphous metal, wherein said second amorphous metal is a composite material made of amorphous metal that contains manganese (1 to 3 atomic %), yttrium (0.1 to 10 atomic %), and silicon (0.3 to 3.1 atomic %) in the range of composition given in parentheses; and that contains the following elements in the specified range of composition given in parentheses: chromium (15 to 20 atomic %), molybdenum (2 to 15 atomic %), tungsten (1 to 3 atomic %), boron (5 to 16 atomic %), carbon (3 to 16 atomic %), and the balance iron, and said system directing said two deposition sprays onto the structure, wherein said system directing said two deposition sprays onto the structure further includes applying said first amorphous metal to the structure by deposition to form a first layer, and applying said second amorphous metal to the structure by deposition to form a second layer producing the graded corrosion-resistant amorphous-metal coating on the structure.