GSO ISO 2143:2015 氧化铝涂层和铝合金 密封后阳极氧化涂层吸收性损失的测定 初始酸处理的染斑试验
Anodizing of aluminium and its alloys -- Estimation of loss of absorptive power of anodic oxidation coatings after sealing -- Dye-spot test with prior acid treatment
This International Standard specifies a method of estimating the loss of absorptive power of anodic oxidation coatings that have undergone a sealing treatment, by dye absorption after acid pretreatment. The method is suitable for use as a production control method and is applicable to anodic oxidation coatings which may be subjected to weathering or aggressive environments, or where resistance to staining is important. The method is not applicable to those coatings that: a) are formed on alloys containing more than 2 % copper or 4 % silicon; b) are sealed by the dichromate process; c) have been given supplementary processing, e.g. oiling, waxing or lacquering; d) are coloured in deep shades; e) are less than 3 μm thick. The method is less appropriate where nickel or cobalt salts, or organic additives, have been added to the sealing bath.