| Waterborne aluminium-based metallic micro-powder coating is the coating that Al-Zn powder, the aqueous solution of the inorganic metal salt, a small amount of chromium anhydride , organic or inorganic reducing agent is mixed into the material of thick liquid, put into surfactant and other additive, mix into a waterborne metallic micro-powder coating , coat it on the metal surface, form the coating of metal base through fritting. Because technology of this coating adopts the substituting chromium anhydride of compound phosphate part as binder of the coating, therefore has reduced the content of the chromium in the coating. However, with the strengthening of regulation of environmental protection, no-chromium has become the development trend of technology of this coating, waterborne aluminium-based metallic micro-powder coating of short of chromium has not adapted the strict requirement for environment protection more and more. In addition, the mechanism of shaping coating of waterborne aluminium-based metallic micro-powder coating is studied not enough deep, this cause this coating craft there is blindness of a certain degree in concrete application, there is no precise theoretical direction, has influenced application and development of technology of this coating.To solve these situation, this paper in improving original short chromium waterborne aluminium-based metallic micro-powder coating foundation that craft fills a prescription, develop , have no chromium waterborne aluminium-based metallic micro-powder coating , combine the study on coating , performance, attempt to study mechanism of shaping coating of waterborne aluminium-based metallic micro-powder coating.The paper start with preparation of powder, utilize basic theory knowledge of particle studying , physics , chemistry , metallorgaphy, ore dressing and mechanical alloy, have studied and confirmed the relevant parameters of preparing the craft of micro-powder. The metal micro-powder suitable for technology of this coating have been prepared.The paper utilize orthogonal test improve short chromium waterborne aluminium-based metallic micro-powder coating treatment liquid of coating fill a prescription and prepare technological process, develop , have chromium waterborne aluminium-based metallic micro-powder coating craft of coating fill a prescription on this basis.Through paint layer able to bear corrosivity , heat resistance , combine intensity and hole experiment of rate thesis, short of chromium with have chromium waterborne aluminium-based metallic micro-powder coating with plate layer compare while being other, carry on comprehensive analysis on every performance index . People for in painting because it plate whether layer mark by trough mark of matriceses deep, to investigate is different to scribble (plate) by layers of corrosion behavior and protection situation against matrices at states damaged. Through compare with , have anti-corrosion performance of coating that rare-earth element put into , analyze the rare-earth element impact on corrosion resistance of coating.Use the metallography microscope, the modern material detection means of analyzing etc. that scan the electric mirror , energy spectrum, observe and research in shape looks , combination state of matrices , space position to the coating ,etc., chemical composition in the coating of statistical analysis.According to the study on performance of coating, structure, set up the structural models of the coating tentatively, propose one layer of mechanism of shape of the coating. Waterborne aluminium-based metallic micro-powder coating have no electric crystallization in the forming process of coating, have no high-temperature metallurgy react, shape its one layer of mechanism different from the traditional crystallization way, so technology of this coating belongs to one kind among the technology of obtaining the dense plural alloy-layer by way of there is no crystallizationing. |
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