In 1953,the American welding society of thermal spraying zinc and thermal spray aluminum in the industrial environment,water environment (not half submerged in flowing seawater and fully immersed in water to flow, and oceanic environment three categories of industrial test of 19 years, on the 4248 pieces of specimens, the test results show that the spray zinc,aluminum and closed coating can all of the above three types of environment of steel structures to provide long-term effective anti-corrosion protection,unveiled the world's most famous hot spraying 19 years AWSC2 14-74 test report.

American LAQUE 34 years anti-corrosion coating technology center in Marine atmosphere corrosion performance test report confirmed that the thermal spraying zinc and aluminum coating on a variety of harmful environmental medium and long-term effective, the United States on the basis of this combined with 19 years report, formulated the AWSC2 18-93 thermal spraying operation guide, as the thermal spraying construction enterprise quality control manual, in order to direct production.

The us navy's civil engineering laboratory has been tested for 10 years of Marine climate and sea water for 75 mu m thick spray zinc and aluminum coating,and no red rust has been found to prove that the coating is effective.

The French underground railway company has been exposed to zinc and aluminum for 10 years, and the results show that anti-corrosion is effective.

The former Soviet tbilisi underground mine water test pointed out that the spraying of zinc is at least 30 years of corrosion resistance.

The results are consistent across countries. Heat spraying zinc and aluminum coating can provide long-term and effective protection of steel in the Marine atmosphere, industrial atmosphere and seawater environment. These test results directly as standards based on the thermal spraying anti-corrosion technology,directly promoted the large steel Bridges since the 1960 s the world developed countries the application of thermal spraying anti-corrosion,for the world to make a huge contribution to the development of thermal spraying.

The application of thermal spraying in the bridge, has started in the 1930 s, the development to 60 ~ 70 s, Europe every year used in thermal spraying zinc wire up to 40 million pounds, the United States each year the thermal spraying zinc wire up to 2 million pounds;The corrosion resistance of general thermal spraying composite coating is 20 ~ 40 years.

Many Bridges in Britain have more than 25 years of zinc spray.Responsible for bridge maintenance engineers, according to their experience of large-scale structure spraying zinc that bridge in the bad environment, hard to get to the bridge or not likely to be close to, spraying zinc, aluminum is a kind of effective treatment methods. The UK has cited examples of the use of thermal spraying in large steel and steel Bridges across the country,all of which have been effective for more than 25 years without maintenance.

Koons ferri madden, reed fourth highway bridge,It is the world's largest steel bridge in the 70 s, 20000 t steel, spraying zinc wire 1 million pounds, anti-corrosion effect is very good, with over 20 years without maintenance.

South wales Newport (New port) George street Bridge (George Steet Bridge), founded in 1964, is located in the highly industrial pollution environment,using spray zinc corrosion,by 1985,namely after 21 years with no maintenance, check the coating in good condition,and confirmed that at least 5 years without maintenance.

Scotland's luxury linse feely (Qucesferry) fourth road bridge, built in 1960 ~ 1964, the bridge mainspan 1000 m, is located in the windy Marine environment, with spray zinc and closed processing, after 13 years without maintenance, found that coating color is still in good condition, structure and perfect.

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