Hybridized polypyrrole nanowire-molybdate conversion liquid for magnesium alloy surface treatment and application method thereof
A polypyrrole nanowire and surface treatment technology, which is applied in the direction of metal material coating technology and other directions, can solve the problems of high process operation requirements, poor corrosion resistance of conversion coatings, and difficulty in meeting engineering requirements, and achieves good compatibility and improved performance. The effect of anti-corrosion ability and fast film forming speed
Inactive Publication Date: 2017-05-31
巢湖云海镁业有限公司
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Problems solved by technology
At present, the commonly used chemical treatment solutions for magnesium alloys mainly include chromate, permanganate, phosphate, permanganate-phosphate and other solution systems. Among them, the process of chromate conversion coating is the most mature, but hexavalent chromium is a high Carcinogens are currently banned from use. Although other types of treatment solutions are more environmentally friendly to a certain extent, the conversion coatings formed have problems such as poor corrosion resistance and cracks in the film layer, which are difficult to meet engineering needs.
In order to improve these defects in the chemical conversion coating, researchers can significantly improve the microstructure of the conversion coating by adding nanoparticles to the conversion solution, as shown in the research results of the article "Influence of Nanohardness on the Microstructure of Chemical Conversion Coating". Nano-Al 2 o 3 , nano-SiO 2 Adding can effectively increase the number of conversion coating grains, increase the density of the conversion coating, and obtain higher corrosion resistance, but improving the dispersion of nano-powders in the conversion solution is still a difficult problem to overcome. High requirements, limited application
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[0020] A hybrid polypyrrole nanowire molybdate conversion solution for surface treatment of magnesium alloys, the conversion solution is prepared from the following raw materials in parts by weight: sodium molybdate 30, sodium chloride 2, sodium citrate 4, ten Sodium dialkylbenzene sulfonate 1, polyvinylpyrrolidone 1, phytic acid-doped polypyrrole nanowire 3, deionized water, and glacial acetic acid.
[0021] The preparation method of the hybrid polypyrrole nanowires is as follows: polyvinyl alcohol, cetyltrimethylammonium bromide, phytic acid, 2-acrylamide-2-methylbenzenesulfonic acid, pyrrole monomer and Ionized water was put into the reaction vessel according to the molar ratio of 10:1:1:2:1:500, stirred and reacted at 12°C for 3 hours, then the aqueous solution prepared with ammonium persulfate equimolar to pyrrole was added dropwise, stirred evenly The constant temperature reaction was continued at 12°C for 3 hours. After the reaction, the system was suction-filtered, and...
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Abstract
The invention discloses hybridized polypyrrole nanowire-molybdate conversion liquid for magnesium alloy surface treatment. The conversion liquid selects sodium molybdate as a main film forming agent, and uses sodium chloride, sodium citrate, polyvinylpyrrolidone and the like as assistants; an added hybridized polypyrrole nanowire is prepared with phytic acid, 2-acrylamide-2-methylbenzene sulfonic acid compounded as doping acid and with polyvinyl alcohol as a protective agent; the hybridized nanowire has such effects as electric conduction and corrosion resistance; solution is excellent in stability; compared traditional nanoparticles, an unique one-dimensional linear structure is easier to form an uniform and compact coating layer on a metal surface, so that the long-acting protection effect is achieved; and through the synergistic effect with a sodium molybdate conversion film, the magnesium alloy surface corrosion resistance is improved, meanwhile, the electric conductivity is not influenced, and the hydrophobicity is improved.
Description
technical field [0001] The invention relates to the technical field of magnesium alloy surface treatment, in particular to a hybrid polypyrrole nanowire-molybdate conversion liquid used for magnesium alloy surface treatment and a use method thereof. Background technique [0002] Magnesium alloy is a lightweight, high-strength metal material. Products with the same strength can even be lighter than plastics. Its ability to withstand impact loads is greater than that of aluminum alloys. At the same time, magnesium alloys also have good processing performance, fast heat dissipation, Anti-seismic, anti-electromagnetic wave, recyclable and other advantages are widely used in aerospace, 3C products, sports equipment and other fields. Especially in recent years, 3C products have gradually developed in the direction of thinner and shorter, making high-performance magnesium alloys more favored by manufacturers. . [0003] Although magnesium alloys have the above advantages, due to t...
Claims
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IPC IPC(8): C23C22/40
CPCC23C22/40
Inventor 王青锋丁守君
Owner 巢湖云海镁业有限公司