Using Electroless Method to Improve Corrosion Resistance of Magnesium Alloy (AZ91D)

• Main Authors: Bo-Cun Chen, 陳柏村
• Other Authors: Allen Bai
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/93245907363277636156

碩士 === 高苑科技大學 === 機械與自動化工程研究所 === 102 === Abstract Oxide coating on AZ91D alloy was prepared to improve anti-corrosion property by pulse- reverse plating and micro-arc oxidation technique. In this study, the pulse-reverse plating structure a homogeneous oxide coating to increase the hardness, thickness and corrosion resistance. The up limit voltage of pulse plating potential is an important factor to improve anti-corrosion character of oxide coating on AZ91D alloy. When the up limit voltage is fixed as 240V, the intensity of MgO crystalline peak was shown as XRD pattern. The MgO crystalline peak indicate the oxide coating with a dense layer with anti-corrosion ability. Those composition, sodium hydroxide, sodium citrate, sodium tetraborate, tetramethyl ethylene diamine, phosphoric acid and sodium silicate, in plating solution were studied. Moreover, pre-treatment period, solution temperature, up-limit potential, low-limit potential and duty cycles, were studied for oxide coating on AZ91D alloy for a better anti-corrosion ability. Keywords: AZ91D, magnesiumalloy, magnesium oxide, corrosion resistant, sodium silicate