A Study On Modified Polyethylene Coatings By Flame Spraying

Plastic flame spraying is one of the surface engineering techniques that have the slightest pollution of environment. The polymeric coatings are now widely used as the corrosion resistance, barrier coating in the fields of aircraft, automotive and chemical industry. Currently non-polar Polyethylene (PE) is the most popular materials in the market but the coating can not fit some special needs because its low adhesion. Other materials with high adhesion need to import from foreign countries at very high prices. Developing a modified PE method and a lower cost polymer used in the flame spraying are the objectives of this study. Improving the method of bonding stud with coating surface and studying the process conditions of PE flame spray are important tasks in this work.In this paper the modified PE methods are presented. To improve adhesion and other properties of PE spray coatings, it is expected that the coatings blending PE with the polar polymer brings polar group into the materials of flame spraying or dispersing the nanosized materials in PE matrix improves the absorbability of coatings. The main results of this study are summarized as follows.I To measure the adhesion of polymer coating to steel substrate by the direct pull-off technique, the most efficient way is heating the stud to 210癈 + 10 癈, use it fusion ethylene-methacrylic acid( EMAA) in it's surface then bonding it to the coating surface. This method can warrant effective results as well as experiment repeatability.n The adhesion of PE flame spray coating is improved to a high level as well as the coatings properties such as mechanical property, corrosion-resistant property, salt spray test property and anti light-heat aging property by blending EMAA with PE. Blending25% EMM with PE according to weight percentage can enhance the adhesion of the PE coating by 60% and the impacting height by 58.3%.IJJ Dispersing nanosized TiO2, SiO2-x in PE matrix can improve the adhesion of the PE coating and the intensity of impacting . Nanocomposite coating has the powerful ability of anti light-heat aging. The AlO3 nanocomposite coating has excellent wear-resistance.IV A flame spraying PE material with lower cost and fine properties can be produced by blending 25% EMAA to PE according to weight percentage.Author: Xiong Haiping (Material Science) Directed by: Xiao Yide (Professor) Wu Jianhua (Professor)...