The standard states that the citric acid-sodium nitrate treatment is the least hazardous for removal of free iron and other metallic contamination and light surface contamination.
该标准声明：柠檬酸-硝酸钠处理在去除游离铁合其他金属污染和轻的表面污染物时，危险性最低。
2
Metallic sparking coating was successfully prepared by self-developed superfine aluminum power, and the properties were generally complied with the standard of coating for automobile.
Standard of equivalence of armor plate of the aluminous material of metallic stuff die-casting of water heater, cathode copper, cold rolling, galvanization armor plate has litres bigger.