C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 22/48 (2006.01) C23C 22/07 (2006.01)
Patent
CA 2662611
Disclosed is an aqueous treatment liquid for Sn-plated steel sheets, which is characterized by containing an organic matter (A), a water-soluble chromium compound (B), a water-dispersible silica (C) and water. This aqueous treatment liquid is further characterized in that the organic matter (A) is composed of at least one selected from oxyacids having a ratio of the hydroxyl group to the carboxyl group in a molecule of from 3/1 to 10/1, lactone forms thereof and oxide derivatives thereof, the water-soluble chromium compound (B) does not contain a hexavalent chromium, and the pH of the treatment liquid is within the range of 0.7-6Ø
L'invention concerne un liquide de traitement aqueux destiné à traiter des tôles d'acier plaquées de Sn, caractérisé en ce qu'il contient une matière organique (A), un composé de chrome soluble dans l'eau (B), une silice hydrodispersible (C) et de l'eau. En outre, ce liquide de traitement aqueux est caractérisé en ce que : la matière organique (A) est composée d'au moins un oxyacide choisi parmi les oxyacides possédant un rapport groupe hydroxyle sur groupe carboxyle dans une molécule compris entre 3/1 et 10/1, leurs formes lactoniques et leurs dérivés d'oxyde, le composé de chrome soluble dans l'eau (B) ne contient pas de chrome hexavalent, et le pH du liquide de traitement est compris entre 0,7 et 6,0.
Goto Yasuto
Kozaki Takumi
Kumagai Manabu
Kurosaki Masao
Mizuno Kensuke
Goudreau Gage Dubuc
Nippon Steel Corporation
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