*Article* **A Novel Self-Adaptive Control Method for Plasma Electrolytic Oxidation Processing of Aluminum Alloys**

#### **Kai Yang 1,\*, Jiaquan Zeng 2, Haisong Huang 1, Jiadui Chen 1 and Biao Cao 2,\***


Received: 11 August 2019; Accepted: 23 August 2019; Published: 27 August 2019

**Abstract:** Plasma electrolytic oxidation processing is a novel promising surface modification approach for various materials. However, its large-scale application is still restricted, mainly due to the problem of high energy consumption of the plasma electrolytic oxidation processing. In order to solve this problem, a novel intelligent self-adaptive control technology based on real-time active diagnostics and on the precision adjustment of the process parameters was developed. Both the electrical characteristics of the plasma electrolytic oxidation process and the microstructure of the coating were investigated. During the plasma electrolytic oxidation process, the discharges are maintained in the soft-sparking regime and the coating exhibits a good uniformity and compactness. A total specific energy consumption of 1.8 kW h m<sup>−</sup><sup>2</sup> μm<sup>−</sup><sup>1</sup> was achieved by using such self-adaptive plasma electrolytic oxidation processing on pre-anodized 6061 aluminum alloy samples.

**Keywords:** plasma electrolytic oxidation; electrical characteristic; anodizing; oxidation; aluminum
