1: activation:
Those who make the stainless steel substrate surface activation factors, can speed up the rendering process, all the natural formation of invisible oxide film is the color of the enemy, is the success of hidden color in the color should be removed before. In order to eliminate the stainless steel surface passivity film, get the fresh surface, activation should be appropriate to small bubbles appear after 10 ~ 15s is appropriate, if the activation of lack of time to extend the potential improvement in coloring, excessive activation of the surface corrosion occurred, the color film lost its luster. Activated by acid etching the surface will cause corrosion of activation, after the bright color of the coloring effect. Here are two ways to deal with, to get better results.
Electrolytic activation: phosphoric acid (H3PO4) 10%, stainless steel anode current density 1A/dm2, at room temperature for 3 to 5 minutes, the cathode stereotype.
Chemical activation: sulfuric acid (H2SO4) 10% (volume), hydrochloric acid (HCl37%) 10% (volume), remainder of the water, at room temperature for 5 to 10 minutes.
2: polished:
Required surface finish line, to avoid chromatic aberration caused by the mirror to achieve the best light, can even the most vivid colors. Mechanical polishing is carried out after coloring treatment, if placed in the air after polishing time, the surface will form a layer thickness of 1 ~ 10nm oxide film, color film with different structures, in the coloring solution is not easy to remove, the impact of new color film formation, so that color extended to form a deep dark color change. Electrochemical polishing of stainless steel can also passive film formed on the surface, if not remove the passive film, make coloring rate slows, but electro-polished to form smooth uniform surface, the bright color, uniformity improvement.
Phosphate degreasing and rust are the two basic processes before, relatively speaking, than rust caused great harm to the oil, but also parts of oil directly affects the speed of rust, so rust should be based on the degreasing , but less for oil than rust degreasing the work piece can also be combined with rust two basic processes, simultaneously in a degreasing tank rust removal process can shorten the production line, reducing equipment and plant investment costs, but good processing quality than sub-slot, can be used for less demanding situations. With this process, except for oil should be selected acidic pharmaceutical and supporting the use of herbicides. Rust still using hydrochloric acid, hydrochloric acid rust fast, clean and rust completely, there are very good on the oxide removal function, and because they are used at room temperature, the larger ills of hydrochloric acid mist rust, harmful to health, environmental pollution . With industrial development, environmental protection and improvement of working conditions have become issues of common concern. Therefore, the choice of agents should be considered in environmental protection needs. So I chose to request the preparation of a simple addition to oil, decontamination capability, difficult to clean without sodium hydroxide at room temperature, silicate, OP emulsifier and other ingredients, room temperature, easy to wash, non-toxic substances, does not produce harmful gases good working conditions; selected herbicides to request containing accelerator, corrosion inhibitors and inhibitors, can improve the speed of rust and prevent corrosion and hydrogen embitterment of the work piece produced, can be better to suppress acid mist. Particularly noteworthy is the inhibition of acid mist, acid mist generated in the process rust, corrosion of equipment and plants not only pollute the environment, and can cause tooth erosion, tooth conjunctiva redness, tearing, pain, dry throat, cough, etc. symptoms, therefore, effectively inhibit the mist, not only the needs of environmental protection, or the unit's own needs.
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