Chemical conversion coating method and aluminum material of aluminum material surface

摘要

They are 3 - 12g/L chromium nitrate density Cr (NO₃) the surface of the aluminum material which consists of the aluminum or aluminum alloy, as _3, vanadic acid ammonium density they are 0.5 - 7g/L as NH₄ VO_3, fluoridation titanium kalium density they are 0.5 - 3g/L as K₂ TiF_6, lithium fluoride density they are 0.5 - 3g/L as LiF, nitric acid density they are 0.5 - 1.8mL/L as HNO₃, liquid temperature is 40 - the 50C, executing the chemical conversion coating 1 - 5 minutes in the processing liquid which contains the chrome of 3 value, corrosion-resistant characteristicThe aluminum material which possesses the membrane which and forms the membrane which is superior in adhesion of the coating film, is formed with the chemical conversion coating method, and the said chemical conversion coating method of the aluminum material surface.