Tinplate production process and performance characteristics
Tin tin the use of acidic plating process, also can be hot-dip tinning process. Surface of thesilver-white plate after plating tin, this tin coating thickness is about 0.4 ~ 4ΜM, generaltechnical tin amount per unit area (G/M2). Tin after tin plating layer porosity, corrosion resistance is not good. Must be in the electroplating soft dissolve processing or passivation to the surface to generate tin alloy layer and the tin oxide layer. The coating light, and the binding force of the coating and the steel plate to enhance and reduce the porosity, in order to effectively improve the corrosion resistance.
Tinplate surface plating, tin, tin electrode potential than iron, chemical stability, so the corrosion protection effect on steel plate from. But must maintain the integrity of the tin coating, ifscratched, or even only a tiny pore exposed steel will make steel plate produced anodiccorrosion quickly corroded.
Tinplate production process as follows: tin plating of pickling low-carbon steel sheet → → softsolution processing → passivation → oiling → Check → shear → Category → packaging.
Tinplate by the metallographic analysis of its organizational structure as follows: a total of fivefrom the inside out.
(1) steel substrates. Can general with a thickness of 0.2 ~ 0.3MM.
(2) tin alloy layer. For the tin Ferroalloys structure, plating tin plate tin content to <1G/M2, hot-diptin plate for 5G/M2.
(3) tin layer. The tinned amount of the pure tin layer, electroplating tin plate the 5.6G/M2 ~ 22.4G/M2, hot-dip the tinplate 22.4G/M2 ~ 44.8G/M2.
(4) oxidation film. Mainly stannous oxide, tin oxide, etc..
(5) film layer. Cotton seed oil or dioctyl sebacate.