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Industrial aluminum impurities other ingredients on the influence of aluminum surface treatment
industrial aluminum impurities other ingredients on the influence of aluminum surface treatment from oxidation and asked if the oxide film colorless, transparent, 5 and 6 series of industrial aluminum is better, and can also be after oxidation coloring. If only to anodic oxidation, forming a dense layer of anodic oxide film, no requirements for color, most of the industrial aluminum can be oxidized. Before selecting oxidation process, deal with aluminum or industrial aluminum materials, because of the merits of the material quality, the different ingredients contained, will directly affect the quality of the aluminum anodic oxidation after. Aluminum surface, for example, if there are defects such as bubbles, scratches, peeling, roughness, after anodic oxidation, so all will manifest. The alloy elements, on the surface of the anode oxidation after the appearance, has a direct impact. Industrial aluminum containing copper, silicon, iron and other impurities on the surface appearance of oxide film of performance is as follows: industrial aluminum can make copper oxide film be suffused with red, destroy the electrolyte quality, increase oxidation defects; Can make silicon oxide film become grey, especially when the content is more than 4. 5%, the effect is more obvious; Iron because of itself characteristic, after anodic oxidation will exist in the form of black spot. And other impurities in the alloy composition influence on appearance of oxide film: 1 & ndash; 2% manganese industrial aluminium profile, brown and blue after oxidation, with the increase of manganese content in the aluminum, the surface of oxidized from blue brown to dark brown color. Silicon-based 0. 6 - 1. It is gray after 5% of industrial aluminum extrusion, oxidation, silicon-based 3 & ndash; 6%, white and gray. Opacifying color zinc, chromium is golden brown to gray uneven tone, containing nickel with pale yellow. In general, only the magnesium aluminum and titanium content is more than 5% of gold, industrial aluminum after oxidation can be colorless, transparent and bright and bright and clean appearance. Indicate that some aluminum appearance make a different color, the color is not oxidation, but after anodized aluminum, dyeing or electrolytic coloring. What color dyeing basic, and electrolytic coloring is less, can do, black, bronze, champagne, golden color, imitation stainless steel color. Aluminum is the most common and harmful impurity in the iron, in the process of construction of industrial aluminum production, industrial aluminum profile when the iron content is more than 0. 25% is not very normal tone, with the increase of iron content, gloss, tonal slant blue, light gray mantle was ugly. When low silicon content in gold, iron is more obvious, the effect of silicon on the high side when in a certain extent, reduce the harmful effects of iron, the iron and silicon to form AlFeSi intermetallic compounds, but also consume a part of the excess of silicon. Iron influence the formation of iron and aluminum is the main reason of the color or rod organization, from several microns to several microns, the electrode potential and aluminum is different, therefore affecting the oxidation coloring uniformity and continuity, also reduce oxide film gloss and transparency, affect the shading effect. A small amount of copper on the mechanical property of aluminium profile and surface brightness is good, and won't reduce corrosion resistance. But long black oxide film, copper content to the naked eye can see. A small amount of manganese can eliminate the harmful effects of AlFeSi organization to some extent, and reduce the generation of extrusion lines. But the high content of manganese oxide film yellow, with the increase of manganese content gradually to tan, shading effect is poorer. High zinc content, increased the difficulty of aluminum extrusion, profiles, coarse grains, mould loss is big, the oxide film is opacifying color, and lead to zinc ion in alkali corrosion fluid accumulation, zinc in the profiles on the horse, produce shining pear skin spots. Titanium content is greater than zero. When 1% of aluminum coloring colors and color difference are bigger, the influence of the nonuniformity of the titanium. Therefore, from guarantee the surface quality of aluminum, iron content should be controlled in 0. Below 25%, other impurity content should be less than 0. 1%.