冷延鋼板の表面状態と化成処理性におよぼす Ti, Mn の影響

概要

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The effects of titanium and manganese contents on the surface state and the phosphatability of cold rolled steel sheets have been investigated with ESCA and SEM analyses. The Mn-oxide and Ti-oxide are preferentially formed on the surface during annealing at 780℃ in H_2-N_2 atmosphere. The surface concentration of Mn is three or four times as large as that of Ti on the 0.3Mn-0.2Ti added cold rolled steel sheet in this annealing condition. The bulk Ti and the surface Mn-oxide affect the phosphatability whereas the surface Ti-oxide of a few at% does not interfere the phosphating reaction. The bulk Ti is electrochemically oxidized to Ti-oxide during phosphating. This reaction, which is accompanied by the evolution of hydrogen, suppresses the precipitation of phosphate crystalline. On the other hand, the surface Mn-oxide is able to dissolve in phosphate solution, and this dissolution increases the pH of the solution, resulting in the acceleration of the phosphate film formation.
社団法人日本鉄鋼協会の論文
1991-03-01