Cast iron, which is characterized by lower cost, easily founding to shape and excellent comprehensive mechanics performance, has been widely using for a region of industrial application. Arc spraying, which belongs to a family of thermal spraying technique enhancing surface properties, has been increasingly applying in the industrial of maintenance and manufacture. Not only can it renews dimensions of components, but also strengthens parts?surface hence endows parts with special performance. For many years, researcher have systematically studied on Are spraying technologies. With the rapid development of technology, facilities and basic theory of Arc-spraying technique, it is becoming better and approaching perfection day by day, so it have been gotten wide applications in industries. It has been a ripe technology that application of thermal-spraying on substrate of steel and aluminum, but in-depth systematical studies for Arc-spraying coatings on substrate of cast iron and its applicatibn is still lacking. So, the aim of the present study was to establish foundation for successful application of Arc- spraying, therefor guide worker’s practical manipulation. There different cleaning methods for substrate of cast iron—-fire baking solution clean and lye cook clean were done to compare the effect of removing oily dirt by quantitative analysis. The results indicated that baking is the best way to removing oily dirt on or in the substrate, it can greatly improve the adhesive strength between coatings and substrate. Single factor variance analysis was applied to study effect significance of grit-blasting technology parameters on adhesive strength and surface roughness, which include blasting distance, blasting angle, blasting amount and blasting pressure. Quadratic regress rotary combination analysis was applied to study the effect relationship between parameters?of grit-blasting (blasting distance, blasting angle and blasting pressure) and adhesive strength. Results showed that grit-blasting could greatly come up to the demand of surface pretreatment for Arc-spraying. 54 Orthogonal test and multiple factor variance analysis were applied to study the influence of spray technology parameters, including spraying electric current, spraying distance and spraying gas pressure, on coatings?properties which mainly includes adhesive strength, porosity and hardness. The optimized Arc- spraying technology parameters of 4 2mm 3Cr13 was presented.
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