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锡青铜除了具有良好的耐磨性外,还具有良好的耐腐蚀性能,无论是在大气、蒸气、淡水或海水及碱性水溶液中都具有很高的化学稳定性。因此,锡青铜广泛用于在海水中工作压力不高的船用阀门和管件等。1铸造锡青铜阀门工艺难点锡青铜结晶温度范围很宽,呈糊状凝固,流动性很差,补缩困难,容易产生枝晶偏析和分散的缩孔(缩松),不易得到组织致密的铸件,耐水压性能不好,有时在低压下铸件也会发生渗漏现象[1]。
Tin bronze, in addition to its good abrasion resistance, also has good corrosion resistance and high chemical stability in the atmosphere, steam, freshwater or seawater and alkaline aqueous solutions. Therefore, tin bronze is widely used in marine valves and fittings that work under pressure in seawater. 1 cast tin bronze valve process Difficult Tin bronze crystallization temperature range is wide, was paste-like solidification, poor liquidity, shrinkage difficult, prone to dendritic segregation and dispersion of shrinkage (shrinkage), not easy to get dense tissue castings , Water pressure performance is not good, sometimes under low pressure castings will leak phenomenon [1].