Tin-plated steel sheet and method for manufacturing the same

Details Tin-plated steel sheet and method for manufacturing the same Tin-plated steel sheet and method for manufacturing the same

C - Chemistry, Metallurgy

23

C

C23C 22/08 (2006.01) C23C 28/00 (2006.01) C25D 11/36 (2006.01)

Patent

CA 2624852

A tin plated steel sheet comprising a steel sheet, a tin-containing plating layer superimposed on at least one major surface of the steel sheet and a chemical treatment film containing P and tin superimposed on the plating layer, wherein the chemical treatment film adheres in an amount of 1.0 to 50 mg/m2 or more in terms of P per surface, and wherein as determined from the P2p peak and Sn3d peak intensities of the chemical treatment film measured from the surface according to X-ray photoelectron spectroscopy, the atomic ratio of Sn to P, Sn/P, is in the range of 1.0 to 1.5, while as determined from the P2p peak and O1s peak intensities, the atomic ratio of O to P, O/P, is in the range of 4.0 to 9Ø Phosphate chemical treatment film provided on the tin plated steel sheet, as a replacement of conventional chromate film, is capable of inhibiting performance deterioration attributed to growth of tin oxide film at its surface layer.

Cette invention concerne une tôle d~acier étamée comprenant une tôle d~acier, une couche de placage à base d~étain superposée sur au moins une surface principale de la tôle et un film de traitement chimique contenant du phosphore et de l~étain superposé sur la couche de placage, ledit film adhérant dans une quantité de 1,0 à 50 mg/m2 ou plus en termes de phosphore par surface et, tel que déterminé à partir des intensités de crête P2p et Sn3d du film de traitement chimique mesurées depuis la surface selon une spectroscopie photoélectronique à rayons X, le rapport atomique de l~étain au phosphore, Sn/P, étant compris entre 1,0 et 1,5, alors que, tel que déterminé à partir des intensités de crête P2p et O1s, le rapport atomique de l~oxygène au phosphore, O/P, est compris entre 4,0 et 9,0. Le film de traitement chimique au phosphate disposé sur la tôle d~acier étamée, à la place d~un film au chromate classique, permet d~inhiber une altération de performances due au gonflement d~une pellicule d~oxyde d~étain sur sa couche de surface.

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