Corrosion-resisting surface treatment method for stainless steel in high-corrosion environment
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A corrosive environment and surface treatment technology, applied in chromate treatment, surface reaction electrolytic coating, electrolytic inorganic material coating and other directions, can solve the problems of intensified corrosion, high cost, restricting production development, etc., reaching time-consuming The effect of short, outstanding anti-fouling ability and dense film layer
Inactive Publication Date: 2012-09-26
SHENZHEN CANDORTECH INC CO
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[0005] In the oil refining industry, due to the quality of crude oil, the corrosion phenomenon is seriously intensified, and the materials used in places that are prone to corrosion become more and more important. The problem caused by poor quality materials is that they are easy to be corroded, and need to be shut down for replacement and maintenance , but the cost of materials with too high quality remains high, which has become a bottleneck restricting the development of processing and production in corrosive environments
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Embodiment 1
[0017] Treatment of ring packing 304 base material
[0018] Process route: hot alkali chemical degreasing-hot water washing-water washing-water washing-oxidation-water washing-water washing-water washing-electrolysis-water washing-water washing-water washing-natural drying
[0019] Use hot alkali to chemically remove oil, and the solution temperature is controlled at 90°C to completely remove the oil stains on stainless steel parts during processing;
[0020] The oxidation step:
[0021] The composition of the oxidation solution includes CrO3 200g / L, H 2 SO 4 150g / L, Na 2 MoO 4 100g / L. Under the temperature condition of 75°C, the oxidation time is 10 minutes.
[0022] Wherein the electrolysis step:
[0023] The electrolytic solution composition includes CrO 3 100gL, H 2 SO 4 150gL, Na 2 MoO 4 100gL, H 3 PO 4 250g / L. The stainless steel piece was used as the cathode, and electrolyzed for 10 minutes at room temperature.
[0024] The washing and drying step:...
Embodiment 2
[0028] The treatment process of plate packing
[0029] Process route: hot alkali chemical degreasing - hot water washing - water washing - water washing - oxidation - water washing - water washing - water washing - electrolysis - water washing - water washing - water washing - natural drying
[0030] Use hot alkali to chemically remove oil, and the temperature of the solution is controlled at 95°C to completely remove the oil stains on stainless steel parts during processing;
[0031] The oxidation step:
[0032] The composition of the oxidation solution includes CrO3 300gL, H 2 SO 4 280g / L, Na 2 MoO 4 50g / L. Under the temperature condition of 85°C, the oxidation time is 10 minutes.
[0033] Wherein the electrolysis step:
[0034] The electrolytic solution composition includes CrO 3 50gL, H 2 SO 4 300gL, Na 2 MoO 4 45gL, H 3 PO 4 500g / L, stainless steel parts as the cathode, electrolysis at room temperature for 10 minutes.
[0035] The washing and drying s...
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Abstract
The invention relates to a corrosion-resisting surface treatment method for stainless steel in a high-corrosion treatment. The corrosion-resisting surface treatment method is characterized by comprising a treatment link comprising a washing step, an oxidizing step, an electrolyzing step, a cleaning step and a drying step; carrying out chemical oil removal with thermokalite, and eliminating oil stains of a stainless steel part in a processing process; and carrying out total immersion oxidization passivating treatment on the stainless steel part with oxidizing solution added with molybdate, so as to generate oxide in high oxidization valence state on the surface of the stainless steel, wherein electrolyzing comprises that a metal part is taken as a cathode, the metal part is immersed into an electrolyte containing the molybdate, electrolyzing is carried out for 10 minutes at normal temperature, then washing is carried out for 3-5 times with clear water, and then the metal part is suspended and drained. Through the treatment, a protective film with the thickness of 100-700nm is generated on the surface of the stainless steel, the Cr content in the protective film reaches up to 40-50%, while the Fe content is only 10-20%, and the Mo content is doubled. The method disclosed by the invention adopts common reagents, can be completed on relatively simple equipment, consumes less time and has a simple process while the effect that the stainless steel part with excellent corrosion resistance, heat resistance and scaling resistance can be obtained is realized.
Description
【Technical field】 [0001] The invention relates to the fields of oil refining, petrochemical, chemical, and petroleum product processing equipment, in particular to a corrosion-resistant surface treatment method for stainless steel working components in highly corrosive environments such as oil refining, petrochemical, petroleum processing, and chemical engineering. 【Background technique】 [0002] In oil refining, petrochemical, chemical, seawater treatment and other devices, there is a relatively high corrosive medium environment. Such as organic acids and chloride ions in oil refining units, fatty acids in chemical plants, etc., and Cl in seawater treatment units - Wait. [0003] There are many ways to prevent metal corrosion, the main ones are: 1. Improving the intrinsic corrosion resistance of metal materials; 2. Coating and plating of non-metallic materials or non-metallic protective layers; 3. Treating corrosive media; 4. Electrochemical protection. In this patent app...
Claims
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