Application of the response surface method to optimize the chemical composition and hardness of the aluminum oxide coating created by the electrolytic plasma method

Subject Areas : journal of New Materials

Babak Ghorbanian ¹ (Faculty of Materials and Metallurgical Engineering, Semnan University, Semnan, Iran)
Mohammad Tajally ² (Faculty of Materials and Metallurgical Engineering, Semnan University, Semnan, Iran)
Mohammad Mousavi Khoie ³ (Faculty of Mining and Metallurgical Engineering, Amirkabir University of Technology, Tehran Iran)
Hossein Tavakoli ⁴ (Faculty of Materials and Metallurgical Engineering, Semnan University, Semnan, Iran)

Received: 2018-09-21 Accepted : 2019-06-23 Published : 2019-06-22

Keywords: Electrolytic plasma oxidation, &alpha, -Al2O3, γ-Al2O3,

Abstract :

Electrolytic plasma oxidation (PEO) oxidation is one of the most important methods for oxidation of materials and coatings. The coatings based on aluminum in the PEO method have two α-Al2O3 and γ-Al2O3 altitudes, which have α-Al2O3 allotropic coatings that have better hardness and abrasion resistance. Therefore, the main objective of the present study is to optimize the alumina of aluminum oxide to increase the amount of α-Al2O3 in the coating produced by the PEO method. In the present study, aluminum 1050 is used as a base metal, and materials such as potassium hydroxide, sodium pyrophosphate, and sodium aluminate are used as electrolytes. To optimize the data, the RSM test design method was used with the Design Expert 7 software. The amount of potassium hydroxide, sodium pyrophosphate and sodium aluminate, independent variables of research and hardness, and the ratio of the highest peak allotropic α-Al2O3 to the highest peak γ- Al2O3 are dependent variables of the research. The results of this study show that the optimal electrolyte composition in order to produce the highest amount of α-Al2O3 phase is 2.9 g / L KOH, 1.15 g / L sodium Sodium pyrophosphate and 0.34 g / L Sodium Aluminate, which is the ratio of peak intensity α -Al2O3 (in the XRD test) on the γ-Al2O3 peak at an optimal level of 622 and a hardness of 1648 Hv.

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