SURFACE-TREATED AL OR AL ALLOY MATERIAL HAVING SUPERIOR COATABILITY AND CORROSION RESISTANCE AFTER COATING

摘要

PURPOSE:To improve the suitability of an Al or Al alloy material to phosphating and to produce a surface-treated Al or Al alloy material having superior coatability and corrosion resistance after coating by forming a Zn, Zn alloy, Fe or Fe alloy plating layer contg. a specified amt. of TiO2 on the surface of the Al or Al alloy material to be treated. CONSTITUTION:A Zn, Zn alloy, Fe or Fe alloy plating layer contg. =1% TiO2 is formed on the surface of an Al or Al alloy material such as a plate-, wire-, rod- or tube-shaped material. The Al alloy contains one or more among Cu, Mn, Si, Mg, Zn, Cr, Ni, etc. A uniform fine phosphate film is then formed on the surface of the plated Al or Al alloy material by phosphating to produce a surface-treated Al or Al alloy material having superior coatability and corrosion resistance after coating.