توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Study on an elaborated method to improve corrosion resistance of zinc phosphate coating
نویسنده(ها): ،
اطلاعات انتشار: اولین همایش بین المللی و ششمین همایش مشترک انجمن مهندسی متالورژی ایران، سال
تعداد صفحات: ۱۲
Coating with a dense and fine grain structure containing fewer defects, due to limiting pathways between the environment and base metal, shows more improved protection properties. The major aim of present research was to exposure of an innovative method called rephosphating, which obviously influences the formation of very fine crystalline zinc phosphate coating on the plain carbon steel. The SEM observations showed the creation of a very fine crystalline coating,using the purposed method. Furthermore, the protection properties of phosphated and rephosph ated samples were described and compared through the Neutral Salt Spray (NSS) test and the electrochemical measuring techniques such as polarization and Electrochemical Impedance Spectroscopy (EIS). The results showed that rephosphating method has beneficial influence onimproving corrosion resistance of coating in compared with it applied by phosphating method. As well, improved paint adhesion of rephosphated sample was observed in compare with phosphated sample. The outstanding point of present investigation was to refer and highlight the significant effect of surface texture circumstance in obtaining coating with improved protective properties, while in the other research activities the similar purpose have been achieved mostly through optimizing bath chemical composition<\div>

۲Effect of Surface Mechanical Activation on Morphology of Zinc Phosphate Coating
نویسنده(ها): ،
اطلاعات انتشار: World Applied Sciences Journal، بيست و ششم،شماره۱، ۲۰۱۳، سال
تعداد صفحات: ۴
The effect of surface mechanical activation such as grinding of surface by 180 grade emery papers, sand blasting and shot blasting on the quality of zinc phosphate coating is discussed in this paper. The morphology of formed layer is investigated by Scanning Electron Microscope technique. These observations shows that a uniform and fine–grained coating with an average crystallite size of 57.65 μm in length is formed on the sand blasted surface compared with the coating formed on the grinded surface with average crystallite size of 118.14 μm in length. Also, preparation of surface by shot blasting leads to the formation of the nonuniform phosphate layer with average crystallite size of 169.72 μm in length. Furthermore, the corrosion resistance of samples are described and compared through the neutral Salt Spray test and the results show that preparation operation of surface by sand blasting has evident influence on improving protection properties of formed phosphate layer.
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