Dalian shot blasting

However, unified standards should also be considered in the construction of subway, such as the rust prevention of a fastener (shield segment bolt). In some places, advanced Dacromet plus alkali resistant coating on the surface is used, which is both beautiful and environmental friendly. However, some places still use the past hot-dip galvanizing. Because hot-dip galvanizing is the process and method that pre-treated steel or cast iron parts are immersed in molten zinc, the zinc layer on its surface is easy to form zinc or zinc iron alloy coating. If the pretreatment of the product is not good, the zinc layer is easy to fall off. If the temperature is too low and the zinc layer of the product is too thick, it will affect the installation and reduce the mechanical properties of fasteners.