What are the characteristics and applications of flange bearings?
What are the characteristics and applications of flange bearings?
PRODUCT
Pickling passivation of post-processing
by：Waxing
2020-10-02
Stainless steel workpiece after pickling and flushing water, available containing 10% (
The mass fraction)
NaOH+4％(
The mass fraction)
KMnO4 alkali 1 raw potassium permanganate solution soak 5 in 71 ~ 82 ℃ ~ 60 min, to remove acid residue, and then rinse thoroughly with water, and dry.
Stainless steel surface after pickling passivation spotted or blotch, can use fresh passivation solution or relatively high concentrations of nitric acid scrubbing and eliminated.
Final pickling passivation of stainless steel equipment or parts should pay attention to protect, use polyethylene mulch or dress, avoid different metal and nonmetal contact.
For acid and passivation liquid waste processing, should comply with the national environmental emissions regulations.
Such as the fluoride waste water can add lime or calcium chloride processing.
Passivation solution as far as possible need not bichromate, such as wastewater containing chromium, can add ferrous sulfate reduction processing.
Pickling may cause martensitic stainless steel hydrogen embrittlement, such as oxygen need to go through heat treatment (
Heated to 200 ℃ heat preservation for a period of time)
。
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