Abstract
In the aluminium content on corrosion resistance of zinc - aluminum alloy coating effects research foundation, through our country typical natural atmosphere and seawater, freshwater environment exposure test and laboratory conditions of neutral salt spray corrosion test and electrochemical methods,study on thermal spraying Zn, Al and Zn-Al15 metallic coatings in different natural environment protection performance of steel. Study found that compared with thermal spraying Zn, Al coating, Zn-Al15 alloy coating on the steel has the same excellent electrochemical cathode protection features of thermal spraying Zn coating, but also has high corrosion resistance characteristics of thermal sprayed Al coating. To further improve the protective properties of thermal spray coatings, on the basis of above, composite protective technology research which is about thermal spray metal coating was carried out. Exposure corrosion tests in Qingdao seawater and Wuhan Yangtze freshwater environment for two years showed that the composite system of thermal spray metal coating which is formed after its closed / coating treatment, is superior to single metal thermal spraying in protection performance. At present, thermal spray Zn-15Al alloy coating and sealing / coating composite protective system has been used in the national water, bridges and other key infrastructure projects.
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