论文部分内容阅读
铅在现代化学工业中广泛用于制作和衬制化工容器、蛇管、反应器和输送腐触性气体及液体的管道。这些化工设备的制造与维修,给铅焊技术的发展创造了现实条件。在化学工业中常用的铅有两种:一种是纯铅(软铅),经常用到的是3号和4号铅,较次要的设备有时也用到5号铅。另一种是硬铅,其中含有适量的锑,有时也加入少量的铜。由于硬铅具有较高的机械强度,而化学耐腐蚀性与纯铅相同或相近,因此目前在化学工业中,尤
Lead is widely used in the modern chemical industry for the production and lining of chemical containers, coils, reactors, and pipes conveying rotting gases and liquids. The manufacture and maintenance of these chemical equipment has created realistic conditions for the development of lead-soldering technology. There are two types of lead that are commonly used in the chemical industry: one is pure lead (soft lead), the third and fourth often used, and the less important one sometimes used lead no. The other is hard lead, which contains an appropriate amount of antimony, and sometimes also add a small amount of copper. Due to the high mechanical strength of hard lead, and chemical corrosion resistance of the same or similar with pure lead, so in the chemical industry, especially