After 1. machining clean and acid pickling deactivation
The stainless steel work piece on the surface usually can remain the iron filings after the machining, and cooling emulsion contaminations and so on at the end of the steel, can cause the stainless steel surface to appear the dirt spot with to rust, therefore should carry on the degreasing to eliminate the oil, again uses the nitric acid clean, both has removed the iron filings at the end of steel, and has carried on the deactivation.
Around 2. welding cleans and acid pickling deactivation
Because the fat is the hydrogen origin, in has not eliminated the fat in the welded joint to be able to form the barometric pressure, after but the low melting point metal pollution (like zinc-rich paint) welds can create the dehiscence front, therefore the stainless steel welds must is clean the bevel and in the both sides 20mm superficial cleaning up, the greasy dirt available acetone scours, the paint rusty stain should use the emery cloth or the stainless steel wire brush first eliminates, then uses the acetone to scour.
Regardless of the stainless steel equipment manufacture uses what kind of welding technology, after welds must clean, all welds the dregs, the splash, the stain and the oxidation tint and so on must remove, eliminates the method including the machinery clean and chemistry clean.The machinery clean has the polish, polishing and spurts the sand blasting pill and so on, should avoid using the carbon steel brush, guards against the surface to rust.In order to obtain the best corrosion resistance performance, may mixes its immersion in HNO3 and HF in the fluid, or uses the acid pickling deactivation paste.In fact often 4 californium 1 weapon clean and chemistry clean unifies the application.
3. hammers the casting the clean
After hammers casts and so on the hot-working stainless steel work pieces, the surface often has oxide skin, the lubricant or the oxide compound pollution, the pollutant including the graphite, the molybdenum disulfide and the carbon dioxide and so on.Should through the shot cold hardening, salt bath processing as well as multi-channel acid pickling processing.If the American stainless steel turbine leaf blade processing craft is:
Salt bath (10min)→ water quench (2.5min)→ sulfur acid pickling (2min)→ cold laundering (2min)→ alkalinity permanganic acid salt bath (10min)→ cold laundering (2min)→ sulfur acid pickling (1rain)→ cold laundering (1min)→ niter acid pickling (1.5min)→ cold laundering (1min)→ hot laundering (1min)→ air drying.
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