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首页> 外文期刊>Journal of coatings technology and research >Optimization of phosphate coating properties on steel sheet for superior paint performance
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Optimization of phosphate coating properties on steel sheet for superior paint performance

机译：优化钢板上的磷酸盐涂层性能，以获得出色的油漆性能

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摘要

The adhesion of electrodeposition (ED) paint on steel sheets for automobiles is highly influenced by the properties of the zinc phosphate coating which is used to improve its corrosion resistance. In the present study, a steel surface was pretreated with two types of zinc phosphate formulations followed by ED painting. The surface morphology, crystal plane, and porosity properties of phosphate coating on steel samples were studied by scanning electron microscope, X-ray diffraction, and electron probe microanalyzer, respectively. The corrosion resistance of painted samples was evaluated by an accelerated corrosion test as well as by electrochemical techniques like cathodic disbonding and AC-DC-AC tests. The phosphate coating enriched with a phosphophyllite structure showed small globular crystals with less porosity, whereas a hopeite structure showed coarse crystals with high porosity and comparatively thicker coating. The maximum corrosion resistance was observed in the painted sample, where the phosphate coating comprised a phosphophyllite structure. On the other hand, the painted samples phosphated with a predominantly hopeite structure showed inferior corrosion resistance perforrrlance. The unphosphated sample showed severe degradation in paint adhesion and corrosion resistance, which substantiates the importance of phosphate pretreatment.
机译：电沉积（ED）涂料在汽车钢板上的附着力受到磷酸锌涂层性能的很大影响，磷酸锌涂层用于改善其耐腐蚀性。在本研究中，钢表面用两种类型的磷酸锌配方预处理，然后进行ED喷涂。通过扫描电子显微镜，X射线衍射和电子探针显微分析仪分别研究了钢样品上磷酸盐涂层的表面形态，晶面和孔隙率。通过加速腐蚀试验以及电化学技术（例如阴极剥离和AC-DC-AC试验）评估了涂漆样品的耐腐蚀性。富含叶绿素结构的磷酸盐涂层显示出较小的球状晶体，孔隙率较低，而闪锌矿结构显示出具有较高孔隙率的粗晶体，涂层相对较厚。在涂漆的样品中观察到最大的耐腐蚀性，其中磷酸盐涂层包含叶绿石结构。另一方面，以磷灰石为主的磷灰石结构的涂漆样品的耐蚀性能较差。未磷酸盐化的样品显示出严重的油漆附着力和耐腐蚀性下降，这证实了磷酸盐预处理的重要性。

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