最常用的锡青铜有 QSn Zn Pb 3.5-6-5和 QSnZn Pb 6-6-3两种,在这些锡青铜中,除了铜和锡(3.5～7.0%),还含有铅(2.0～6.0%)、锌(5.0～7.0%)及少量杂质铁(≤0.4%)、铝(≤0.05%)、锑(≤0.5%)和硅(≤0.05%)。为了测定合金中的锡,可采用桑色素比色法、偏锡酸重量法和碘酸钾容量法。采用桑色素比色法,测定范围狭窄,不能满足生产上的要求;采用偏锡酸重量法和碘酸钾容量法都需沉淀、过 The most commonly used tin bronze is QSn Zn Pb 3.5-6-5 and QSnZn Pb 6-6-3. Among these tin bronze, in addition to copper and tin (3.5-7.0%), lead (2.0-6.0% ), Zinc (5.0-7.0%) and a small amount of iron (≤0.4%), aluminum (≤0.05%), antimony (≤0.5%) and silicon (≤0.05%). In order to determine the tin alloy, can be used morin colorimetric method, partial stannic acid gravimetric method and potassium iodate capacity method. Using Morin colorimetric method, the determination of a narrow range, can not meet the production requirements; using both stannous acid gravimetric method and potassium iodate capacity method are required precipitation, too