The action of silicon to cause the corrosion of
6061 aluminum flat bars is completely avoided and controlled. As long as it is useful to control the raw material and the alloy components, the proportion of magnesium and silicon is within the range of 1.3 to 1.7, and the parameters of each process are strictly controlled to avoid segregation and departure of silicon, so as to make the silicon and magnesium as a favorable Mg2Si as possible. Strengthen the phase.
If we find this silicon corrosion point appearance, we should pay special attention to the surface treatment. In the process of degreasing and degreasing, we should try to use the weak alkaline bath liquid. If the condition is not allowed, the time of soaking in the acid deoiling liquid should be shortened as far as possible. (the qualified aluminum alloy profiles in the acid degreasing liquid are put in 20 ~ 30min, but there is no doubt. The interrogative profiles can only be placed from 1 to 3min), and the pH value of the washed water is higher (pH>4, control Cl- content), and the corrosion time is extended during the alkali corrosion process. In the neutralization of light, the nitrate light is used and the electrooxidation should be quickly used when the sulfuric acid anodized, so that the dark grey corrosion point caused by silicon is made. Not obvious, can meet the use of demand.
