大口径药筒在磷化、钝化后常出现各种点状痕迹。这是由于大口径药筒的自重大,当口部进入液面后,药筒内外产生了压力差,使溶液从药筒穿大孔喷出。喷出的液滴一旦落在不能进入溶液的挂具、工装、吊钩上,当药筒经水洗后,再滴下来便落在药筒上,并分散成许多小滴,使许多药筒产生了溶液点。或者其它溅起的溶液点、或者工房上冷凝水滴下,往往都产生不同颜色的点状痕迹。它们 Large-caliber cartridge in the phosphating, passivation often appear after a variety of punctate marks. This is due to the large caliber cartridge self-weight, when the mouth into the liquid level, the pressure difference between the inside and outside the cartridge, the solution from the cartridge through the big hole. Once the sprayed droplets fall on the hanger, tooling and hook that can not enter the solution, when the cartridge is washed with water, it drops onto the cartridge and disperses into many droplets to make many cartridges The solution point. Or other splashes of solution points, or condensation drops on the workroom, often have different colors of punctate marks. they