C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
148/17, 6/4
C23C 22/10 (2006.01) C23C 22/23 (2006.01) C25D 11/36 (2006.01)
Patent
CA 1321859
27587-40 ABSTRACT OF THE DISCLOSURE The present invention relates to an aqueous solution for depositing a coating consisting predominantly of tin phosphate on an active metal surface in contact with said solution, comprising: (a) from about 1 to about 50 grams per liter of orthophosphate ions; (b) from about 0.2 to about 20 grams per liter of chlorate and bromate ions combined; (c) a pH of about 2 to about 6; (d) a total concentration of simple and chelated tin cations, measured stoichiometrically as tin only, of from about 0.01 to about 5.0 grams per liter; and (e) a concentration of condensed total phosphoric acid and ions derived therefrom, measured stoichiometrically as maximally neutralized ions, of from about 0.01 to about 5 grams per liter, said condensed phosphoric acid having the general formula H(n+2)PnO(3n+1), wherein n = 2, 3, or 4, said concentra- tion of condensed total phosphoric acid and anions derived therefrom being effective to stabilize the soluble tin content of said solution against spontaneous diminution during storage out of contact with reactive surfaces for a period of one day. A coating that confers excellent resistance to corrosion in hot water is thus formed on drawn and ironed thinly tin plated cans.
579848
Aoki Tomoyuki
Matsushima Yasunobu
Ono Yohji
Tanaka Shigeo
Fetherstonhaugh & Co.
Nihon Parkerizing Company Limited
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