Effect of surface mechanical attrition treatment (SMAT) on zinc phosphating of steel

被引：10
|
作者：
Kavitha, C. [1 ]
Ravichandran, K. [2 ]
Narayanan, T. S. N. Sankara [3 ,4 ]
机构：
[1] Jeppiaar Inst Technol, Madras 631604, Tamil Nadu, India
[2] Univ Madras, Dept Analyt Chem, Madras 600025, Tamil Nadu, India
[3] CSIR, Natl Met Lab, Madras Ctr, Madras 600113, Tamil Nadu, India
[4] Chonbuk Natl Univ, Sch Dent, Dept Dent Biomat, Jeonju 561756, South Korea
来源：
TRANSACTIONS OF THE INSTITUTE OF METAL FINISHING | 2014年 / 92卷 / 03期
关键词：
Surface mechanical attrition treatment; Phosphating; Surface roughness; Corrosion resistance; Potentiodynamic polarisation; CORROSION-RESISTANCE; CONVERSION COATINGS; NANOCRYSTALLIZATION; MICROSTRUCTURE; ROUGHNESS; BEHAVIOR; OPTION;
D O I：
10.1179/0020296713Z.000000000121
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
The effects of surface mechanical attrition treatment (SMAT) of EN8 steel on the growth of phosphate coatings, morphological features and corrosion resistance of the resultant coatings have been studied. SMAT enabled the formation of a uniform surface profile although the average surface roughness is increased after treatment. SMAT increased the extent of metal dissolution and the rate of growth of phosphate coating. In spite of the similarity in phase composition, the phosphate crystallite size is relatively high for samples treated by SMAT. Compared to the untreated one, a cathodic shift in E-corr with a corresponding decrease in i(corr) is observed for SMAT treated EN8 steel after phosphating. For all tested samples, zinc phosphate coatings deposited on EN8 steel after SMAT using 8 mm O balls for 30 min offers the highest corrosion resistance. The increase in surface roughness by SMAT is partly compensated by the expected improvement in corrosion resistance.
引用
收藏
页码：161 / 168
页数：8
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