| 摘要 |
<p>1501225 Organosilicon coating for steel sheet NIPPON STEEL CORP 1 Oct 1975 [1 Oct 1974] 40085/75 Heading C7U Steel sheet (which may bear a coating of Al, Zn or Sn) and already having on its surface a corrosion-resistant coating containing an element M selected from Cr, P, Mo, Si, Co, Mn, Cu, Ni, Al and Ti is treated with an aqueous solution containing one or more organosilicon compounds X 3 SiR where R = C 2 -C 10 organic, optionally containing one or more vinyl, epoxy, acryl, or amino groups and X =halogen or alkoxy. The steel may be treated initially conventionally, e.g. with CrO 3 , H 3 PO 4 or salts of Cr, Mo, Si, Co, Mn, Cu, Ni Al or Ti by dipping or spraying or electrolytically, exemplified treatments being CrO 3 /SiO 2 /Ni(NO 3 ) 2 , CrO 3 /Al sol/Cu(NO 3 ) 2 , CrO 3 /K 3 AlF 6 , CrO 3 / Cr<SP>+3</SP>/H 3 PO 4 /H 3 BO 3 or CrO 3 /NaBF 4 /K 2 ZrF 6 / K 3 Fe(CN 6 ); certain of these are followed by heating in H 2 /N 2 . The Si compound is applied in aqueous solution, e.g. 0À5-5 wt. per cent at around 30‹C for 0À5-5 sec; X may be Cl, methoxy, or methoxyethoxy, and preferred compounds are: this treatment is followed by air-blow drying at 100‹C. The resulting coating contains 5-50 mg/m<SP>2</SP> of Si and has enhanced paint adhesion properties.</p> |
