The acid etching mechanism of aluminous profile

Acid etching is the chemical dip corrode below specific requirement. Aluminous profile feels corrode fluid, nimble inside very short time echo makes complexing thing, resonant equation is as follows:
Generated complexing thing and have sure viscosity, adhere to simply at aluminous matrix appearance, form a kind to safeguard film. Knead hold profile to have a lot of subtle moulding mark normally, in the written complaint that show a peak is investigated times higher below microscope, the conglutinate maintenance at aluminous matrix film is in sunken place thicker, protruding part is smaller, small part is felt
The probability of acid etching fluid is bigger, can undertake deliquescent echo quickly continuously; Large part suffers the screen of bur and make speed of concentrated juice echo barratrous, because place of on any account is deliquescent of speed different, arrive at even appearance next, eliminate knead those who hold mark (arenaceous face) inferior smooth action. Reduce thick any crystalline substance and seam line and acid
The specific function of corrode has direct connection, in aluminous profile production, thick any crystalline substance and seam line and mould, knead hold technology and casting club to be changed equably have very big connection, when oxidation pretreatment, alkaline corrode rate is later, thick any crystalline substance and seam line are more austere. Because acid etching rate is rapid, time is short, having notting appearing austere below the circumstance of thick any crystalline substance and seam line, echo already ended, acid etching technology can be consequently useful reduce thick any crystalline substance and seam line.
First in acid etching technology action has acid etching additive the following respects: (Action of 1) delay corrode: Because F- and natural oxidation film and aluminous matrix are resonant rate is very rapid, and resonant and acuteness, present thick any crystalline substance and defect of quality of watch of seam line substandard simply. To can hold to sure and resonant speed already, unapt form quality defect, add the organic compound such as grape acerbity natrium, citric acid natrium, glycerine to restrain speed of acid etching echo, reach delay corrode action next. (2) makes smooth action: Knead hold profile to have a lot of subtle moulding mark, below Gao Beijing investigation shows mountain peak normally, attend phosphoric acid 3 natrium, diatomite, multivariate the compound such as alcohol, can make bottom of cereal of profile moulding mark is safeguarded, aiguille is ground smooth, arrive at full smooth effect next. (3) promotes action: Attend accelerant to be able to make acid etching additive abundant and dispersive go in groovy fluid, and useful enter the lining of aluminous matrix appearance that is masked by complexing content, make echo is able to undertake continuously, avoid to form profile to corrode not divide evenly. (Action of 4) outside activator; Attend acerbity natrium of sulfur of 12 alkyl benzene, 12 alkyl the outside activator such as vitriolic natrium can enhance the ability that remove oil further, and a foam produces in groovy fluid appearance, restrain quantity of heat loses the fluid that reach trough to evaporate, mainer effect is to add groovy fluid stability, because take the outside activator of negative electric charge,this is can adsorptive it is all round particle, make atomic generation electrostatic return power, make next atomic can admirably suspension is not easy in groovy fluid deposit. (Action of 5) metal ion: Attend the metallic ion such as Cu2+ , Ag+ to be able to have prevented to corrode, make arenaceous side effect more exquisite, even, arenaceous the range is distinct.

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