Pickling and passivating treatment process for stainless steel pipes
A technology of pickling passivation and treatment process, which is applied in the direction of metal material coating process, etc., can solve the problems of insufficient passivation film formation, poor finish, and large corrosion of metal substrates, so as to improve the quality of pickling passivation and simplify Process and equipment, the effect of improving the service life
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Embodiment 1
[0038] A pickling and passivation treatment process for stainless steel pipe fittings, comprising the following steps:
[0039] A) Preprocessing
[0040] Use alkaline degreasing solution (the main components are sodium hydroxide, sodium carbonate, sodium phosphate, sodium silicate, the total concentration is 3-5%) for degreasing and cleaning, put the stainless steel workpiece to be treated into the solution, and immerse it for 15 minutes. Remove surface oil, dust, metal grinding dust and other impurities and stains. If there are foreign objects on both sides of the weld, it can be removed with a stainless steel wire brush, stainless steel shovel or grinding wheel.
[0041] Rinse the cleaned stainless steel workpiece with clean water (chloride ion content does not exceed 25mg / l).
[0042] B) Dosing
[0043] Prepare the pickling passivation solution according to the mass percentage concentration of the following formula:
[0044] Nitric acid (specific gravity 1.42) 20%
[0...
Embodiment 2
[0063] A pickling and passivation treatment process for stainless steel pipe fittings, comprising the following steps:
[0064] A) Preprocessing
[0065] Sodium hydroxide solution with a concentration of 3-5% is used for degreasing and cleaning, and the stainless steel pipe fittings to be treated are put into the solution and soaked for 15 minutes to remove surface oil, dust, metal grinding dust and other impurities and stains. Use gasoline or other cleaning agents to deal with oil stains and other dirt. The scale of the stainless steel hot-processed parts can be removed by mechanical sandblasting, and the sandblasting adopts pure silicon spray or aluminum oxide spray.
[0066] Rinse the cleaned stainless steel workpiece with clean water (chloride ion content does not exceed 25mg / l).
[0067] B) Dosing
[0068] Prepare the pickling passivation solution according to the mass percentage concentration of the following formula:
[0069] Nitric acid (specific gravity 1.42) 22% ...
Embodiment 3
[0088] Carry out the pickling passivation treatment of stainless steel fittings by the method for embodiment 1, difference is that described efficient corrosion inhibitor consists of:
[0089] Dichloromethane 18%
[0090] Adipic acid 5%
[0091] Emulsifier OP-10 8%
[0092] Cuprous Chloride 2%
[0093] Isopropanol 4%
[0094] Propylene Glycol 4%
[0095] The rest is water.
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