It can make the product surface form a uniform, dense oxide layer, (a1203.6h20) this film can make the product surface hardness up to (200-300hv). If the special products can be hard anodized, the surface hardness of the products can reach 400-1200hv. Therefore, hard anodizing is an indispensable surface treatment process.
In addition, the wear resistance of this product is very good, so it could be a necessary process of aerospace related products.
Common processes
common anodizing processes are color anodized, satin anodized, and blasting etc.
Negative situation and Treating Method
Spots appear on the surface. This situation is generally due to poor metal conditioning or poor material.
Treating Method: Re-heat treatment. Or change the material.
Surface appears rainbow color. Such situations are usually the result of anodize errors. , loose when hanging, resulting in poor conductive to the product.
Treating Method: Anodize again.
Severe surface bruises and scratches. This situation is generally due to the transport or processing process.
Treating Method: Anodizing again.
White spots appear on the surface during dyeing. This anomaly is caused by the oil or other impurities in the water during anodizing.
Quality standards
The film thickness is 5-25um, the hardness is above 200HV, and the color change rate of the hole sealing experiment is less than 5%
The salt spray experiment lasted for more than 36 hours and reached CNS level 9 or above
Appearance should not be appear bruises, scratches, rainbow color and other situation.
Die-cast aluminum, such as A380, A365 and A382, cannot be anodized.