论文部分内容阅读
一般机械厂中磷化处理的零件较多,磷化溶液中锰的含量每班都需测定,工作量较大。采用硫酸亚铁-高锰酸钾容量法,则需加热煮沸、冷却等手续,费时费电。若用氰化钾掩蔽,铬黑 T 指示,EDTA 滴定,虽然简便,但氰化物有剧毒,废液还需处理。本法则避免了上述两法的缺点。对由[nFe(H_2PO_4)+2]·[mMn(H_2PO_4)_2]和 MnCO_3组成的磷化溶液,用三乙醇胺、氟化铵掩蔽干扰离子,以酸性铬蓝 K-萘酚
General machinery plant in the phosphating parts, phosphating solution in the manganese content of each class needs to be determined, the workload is large. Ferrous sulfate - potassium permanganate capacity method, you need to heat boiling, cooling and other procedures, time-consuming electricity. If masked with potassium cyanide, chromium black T instructions, EDTA titration, although simple, but cyanide is highly toxic, waste also need to deal with. This law avoids the shortcomings of the above two laws. The phosphating solution consisting of [nFe (H 2 PO 4) +2] · [mMn (H 2 PO 4) 2] and MnCO 3 was masked with triethanolamine and ammonium fluoride to remove the interference ions. Acid chrome blue K-