C - Chemistry – Metallurgy – 11 – D
Patent
C - Chemistry, Metallurgy
11
D
C11D 3/08 (2006.01) C11D 1/14 (2006.01) C11D 3/20 (2006.01) C23G 1/14 (2006.01) C23G 5/00 (2006.01)
Patent
CA 2082211
The present invention is directed to a method for degreasing a metal selected from the group consisting of iron, zinc, aluminum, and alloys containing at least two of these metals, said method comprising bringing a phosphate-free degreasing solution in contact with said metal to be processed under a temperature in the range of 20 - 60°C for a time in a range of 1 to 30 minutes, wherein said degreasing solution contains an alkali silicate, a water-soluble polycarboxylate and a nonionic surfactant and satisfies the following (1), (2), (3) and (4) conditions: (1) the pH value of the degreasing solution is 10.5 to 12.5; (2) the concentration of said alkali silicate is 100 ppm or more calculated as Si concentration and satisfactory for the following (a) equation: log10Y 0.318X + 2.72 (a) wherein Y denotes the concentration of said alkali silicate calculated as Si concentration by a ppm unit, X = pH - 10.5, and this pH denotes the pH value of the degreasing solution; (3) the concentration of said water-soluble polycarboxylate is in a range of from 0.01 to 10 g/liter; and (4) the concentration of said nonionic surfactant is in a range of from 0.01 to 10 g/litre, and after bringing said metal into contact with the phosphate-free degreasing solution, replenishing said alkali silicate, said water-soluble polycarboxylate and said nonionic surfactant and adding a caustic alkali to said degreasing solution to maintain the above (1), (2), (3) and (4) conditions for further use with subsequent metals. Metals treated by the method of the present invention exhibit excellent conversion coating performance.
Ishida Minoru
Shiraishi Shoji
Kirby Eades Gale Baker
Nippon Paint Co. Ltd.
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