Tin bronze plate is a non-ferrous metal alloy with the smallest casting shrinkage rate. It is used to produce castings with complex shapes, clear outlines and low air tightness requirements. Tin bronze plates are very resistant to corrosion in the atmosphere, sea water, fresh water and steam, and are widely used in steam boilers and marine ship parts. Phosphorus-containing tin bronze has good mechanical properties and can be used as wear-resistant parts and elastic parts of high-precision machine tools. Leaded tin bronze is often used as wear-resistant parts and sliding bearings. Zinc-tin bronze can be used as high-airtight castings.
Tin bronze plates are the most widely used and used in the electrical and electronic industries, accounting for more than half of the total consumption. Used in various cables and wires, motors and transformers, switches and printed circuit boards; in the manufacture of machinery and transportation vehicles, used in the manufacture of industrial valves and accessories, meters, sliding bearings, molds, heat exchangers and pumps, etc. . It is widely used in the chemical industry to manufacture vacuum vessels, distillation pots, brewing pots, etc. Used in the defense industry to manufacture bullets, shells, gun parts, etc. In the construction industry, it is used as various pipes, pipe fittings, decorative devices, etc.
The critical humidity of tin bronze plate and many other metals is between 50% and 70%. The pollution in the atmosphere has obvious enhancement effect on the corrosion of tin bronze. The acidic pollutants such as CO2, SO2, NO2 in the urban industrial atmosphere are dissolved in the water film and hydrolyzed, which makes the water film acidified and the protective film is unstable. The decay of plants and the exhaust gas discharged from factories make ammonia and hydrogen sulfide gas exist in the atmosphere. Ammonia obviously accelerates the corrosion of copper and tin bronze plates, especially stress corrosion.
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