Electrophoretic coating pickling is usually caused by a mineral acid plus quantitative easing Tong agents, surfactants gram formulations may be made coating additives, their function and role in the disposal of land depends not only play a leading role during the acid type and function, but also on the acid and during this additive ingredients and the ratio between the content of the water.
Pickling principle the most important point is that the onset of action of hydrogen acid and iron, the metal substrate surface oxide machinery falling, so that the positive effects of both hydrogen substrate surface oxide falling, with excess hydrogen have rot quality ãn metal, the metal surface resulting in hydrogen charging, so that the negative influence of the metal to become brittle, in order to reduce the "hydrogen embrittlement" of substrate damage, involvement in a suitable acid buffer ãn agent, buffer ãn agent can form a metallic substrate surface layer polymer film, to discourage further action of acid, then the purpose of arriving inhibition of gram preparation there restraint Shan hair than hydrogen and play a role to reduce the mist transpiration involved a certain amount of surfactant in the acid, degreasing lotion has two effects can rust.
Pickling interests:
Pickled surface obtained relatively flat, smooth, one can only reduce paint consumption, and can look forward to quality surface flatness require higher electrophoretic coating;
Pickling lotion penetrate into every corner of the workpiece, so ãn rust,
grease obtain more full and thorough cleaning, simply choose a good lotion and its associated parameters to obtain excellent control, disposal of guaranteed quality is relatively brief
