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Vol.50, No.11, 809 ~ 816, 2012
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| Title |
| Corrosion Resistance and Low Friction Property of Sintered Steel Parts via Chromizing Treatment |
| 김상권 Sang Gweon Kim , 박용진 Yong Jin Park , 여국현 Kuk Hyun Yeo , 이재훈 Jae Hoon Lee |
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| Abstract |
| Recently, as the interest in improving energy efficiency has grown, the demand for vehicle and machine parts that are resistant in high temperature corrosive conditions and abrasive environments has increased. Pack chromizing treatment of sintered steels is a profitable method that satisfies both corrosion resistance and low friction properties. Since austenitic stainless steels have good corrosion resistance but low mechanical hardness, if they are replaced by sintered steel parts with pack chromizing treatment, all the desirable properties such as low price, easy molding, high hardness, low frictional coefficient, and high corrosion resistance, can be obtained. The higher corrosion resistance of the chromized parts over that of the austenitic stainless steels was acquired by coating chromium carbides and a thin chromium oxides layer on the surface. Moreover, the surface morphology of chromized parts, which were composed of chromium rich phases and hardened chromium carbides by diffusing and alloying, had a peak-and-valley shape so that the dimple effect by the wrinkled morphology and high hardness induced a low friction coefficient. |
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| Key Words |
| Alloys, coating, wear, atomic force microscopy, AFM, sintered steel |
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