抄録
Various methods are used to produce chemically oxidized films on the surface of aluminium and aluminium alloy sheets. All these films, have some extent of luster and their own particular color. Recently, with the use of more aluminium for building materials, demands for luster-less sheets have increased. The method of producing anti-glare film on aluminium sheets by use of Na2SiF6 as the main chemical agent shows good results with 2S sheet. However, in the case of this method being applied to 52S sheet, it is sometimes difficult to obtain a satisfactory film, and there seems to be room for improvement on giving the color and mechanical strength to the film.
With emphasis on producing the color luster and mechanical strength to meet the requirement for building material, this study is to try to bind out the method to obtain a silver colored film by means of an improved chemical bath with other additional chemicals than Na2SiF6.
In this first report, from the results of various preliminary tests, the effects of the treatment conditions of the bath using such additions as H3BO3, NaBF4, NH4ClO4, BaF2, CaF2, and Ca3(PO4)2 to the luster, Marten's scratching hardness, weathering resistance, and chemical resistance were made clear, and the optimum condition for forming an anti-glare film with less luster than those obtained by the conventional methods was established.
