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1532 |
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Corrosion behavior of in-situ Al2O3 formed composite coatings by DC plasma spraying |
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Burak Dikici / Yuzuncu Yil University, TURKEY Cagri Tekmen / Toyota Technological Institute, Material Processing Lab., JAPAN Mehmet Gavgali/ Ataturk University, Department of Mechanical Engineering, TURKEY Yoshiki Tsunekawa/ Toyota Technological Institute, Material Processing Lab., JAPAN Masahiro Okumiya/ Toyota Technological Institute, Material Processing Lab., JAPAN |
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In-situ plasma spraying (IPS) is a promising process to fabricate composite coatings with in-situ formed thermodynamically stable phases. In the present study, mechanically alloyed Al?12Si and SiO2 powder was deposited onto an aluminum substrate by atmospheric plasma spraying (APS) to obtain a composite coating consist of in-situ formed alumina reinforced hypereutectic Al-18Si matrix alloy. The effect of gun current of plasma spraying on the corrosion behavior of the composite coating has been investigated. The corrosion resistances of the composite coatings were analyzed by measuring the cyclic potentiodynamic polarization technique. The surface morphology of composite coatings before and after corrosion tests were determined by using metallographic methods and scanning electron microscopy (SEM). Obtained results are discussed in detail. |