In some cases, if the salt solution of the metal ion content for simple ion, the coating, therefore, coarse grains to adopt complexation ion of plating solution.
有些情况下﹐若镀液中主盐的金属离子为简单离子时﹐则镀层晶粒粗大﹐因此﹐要采用络合离子的镀液。
2
The toughness of weld metal is the highest while the coarse grained region in the HAZ is the lowest because of welding thermal cycle and formation of brittle microstructure.
Mainly coarse grained gold, along with pyrite, pyrrhotite, arsenopyrite, and minor base metal sulfides, occur in networks of quartz veinlets, brecciated wallrock, and disseminated in altered wallrock.