Method for coloring magnesium material micro-arc oxidation coating through weak acid dye

Abstract

The invention discloses a method for coloring a magnesium material micro-arc oxidation coating through a weak acid dye. The method comprises the steps that a magnesium material is subjected to surface treatment through a micro-arc oxidation technology, so that the micro-arc oxidation coating is grown on the surface of the magnesium material in situ; the in-situ grown micro-arc oxidation coating on the surface of the magnesium material is subjected to soaking coloring through a dyeing solution; the dyeing solution is formed by mixing the weak acid dye, dye levellers, a pH value adjusting agent and deionized water, the content of the weak acid dye in the dyeing solution is 1-10 g / L, anhydrous sodium sulfate and sodium dodecyl benzene sulfonate are used as the dye levellers, the content of each dye leveller is 1-5 g / L, the using amount of the pH value adjusting agent is determined by making the pH value of the dyeing solution be 4.5-5.0. Through the method, the magnesium material micro-arc oxidation coating can be in various bright colors, the high bonding force and abrasion resistance of the magnesium material micro-arc oxidation coating are maintained, and the method is simple in production process, capable of achieving mass production easily and free of corrosion to human bodies and equipment and capable of avoiding environment pollution.

Description

technical field [0001] The invention relates to the technical field of surface coloring of magnesium materials (the magnesium materials refer to magnesium or magnesium alloys, such as typical magnesium alloys such as AZ31 and AZ61B), in particular to a method for coloring the micro-arc oxidation film layer of magnesium materials by using weakly acidic dyes . Background technique [0002] Magnesium is an important metal material that is second only to steel in terms of consumption, and is widely used in aerospace, transportation, printing, construction and other fields. However, the color of magnesium material is single and its corrosion resistance is poor, so it is difficult to meet the requirements of various industries for magnesium material decoration and corrosion resistance. In order to improve the decorative effect of magnesium materials, enhance corrosion resistance, and prolong service life, surface treatment is generally required for magnesium materials. [0003] ...

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Problems solved by technology

[0004] At present, the use of micro-arc oxidation technology for surface treatment of magnesium materials can only form white and black micro-arc oxidation films on the surface of magnesium materials, and it is difficult to form bright-colored micro-arc oxidation films.

In the prior art, by adding Cu in the acidic electrolyte 2+ 、Co + and other metal cations form a blue micro-arc oxidation film on the surface of the magnesium material, but the acidic electrolyte will cause greater corrosion to the micro-arc oxidation equipment using stainless steel as the reaction tank, and will cause certain pollution to the environment; disclosed in the patent CN103556205A A method for coloring magnesium alloy micro-arc oxidation composite film is proposed, which is to contain Cu 2+ SiO 2 -ZrO 2 The colloid is solidified on the micro-arc oxidation film on the surface of magnesium alloy. The operation is complicated, and the control of temperature and curing time is high. It is not easy to perform low-cost and large-scale coloring treatment on the micro-arc oxidation film on the surface of magnesium alloy.

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