Effects of Hydroxylamine Sulfate and Sodium Nitrite on Microstructure and Friction Behavior of Zinc Phosphating Coating on High Carbon Steel |
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| Authors: | Yu-dong Xu San Qi Lei Wang Min Shi Ning Ding Zhi-cheng Pang Quan Wang Xu-dong Peng |
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| Institution: | 1.School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China2.Bengbu Yucheng New Materials Science & Technology Ltd. Co., Bengbu 233000, China |
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| Abstract: | Hydroxylamine sulfate (HAS) and sodium nitrite are used as the accelerators for zinc phosphate coating on high carbon steel. Phase evolution of phosphate coating was investigated by X-ray diffraction. It is found that the phosphating coatings are mainly composed of hopeite Zn3Fe(PO4)2·4H2O and phosphophyllite Zn2Fe(PO4)2·4H2O. The microstructural changes of the phosphate coating, as a function of phosphating time, were evaluated by scanning electron microscopy. Four-ball friction experiments reveal that hydroxylamine sulfate instead of sodium nitrite can effectively reduce the friction coefficient of lubricated phosphating coating. Therefore, it may be expected that HAS will be widely used as a fast and ECO-friendly accelerator in phosphate industry. |
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| Keywords: | Hydroxylamine sulfate Accelerator Phosphate coating Friction |
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