CN105603427B - A kind of chemical etching agent and corrugated stainless steel tubing Coating Pretreatment method - Google Patents
A kind of chemical etching agent and corrugated stainless steel tubing Coating Pretreatment method Download PDFInfo
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- CN105603427B CN105603427B CN201510997195.6A CN201510997195A CN105603427B CN 105603427 B CN105603427 B CN 105603427B CN 201510997195 A CN201510997195 A CN 201510997195A CN 105603427 B CN105603427 B CN 105603427B
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- stainless steel
- steel tubing
- corrugated stainless
- chemical etching
- coating
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Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/10—Etching compositions
- C23F1/14—Aqueous compositions
- C23F1/16—Acidic compositions
- C23F1/28—Acidic compositions for etching iron group metals
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/02—Local etching
Abstract
The invention discloses a kind of chemical etching agent and corrugated stainless steel tubing Coating Pretreatment method, which contains following components in percentage by weight: phosphatase 11 %~10%, nitric acid 1%~5%, hydrofluoric acid 0.2%~1%, citric acid 1%~5%, organic amine corrosion inhibiter 0.5%~1%, potassium chlorate 0.5%~1%.Chemical etching processing is carried out to corrugated stainless steel tubing using the chemical etching agent, it can remove the passivating film on corrugated stainless steel tubing surface by the corrosiveness of etching solution, microcosmic corrosion is caused on corrugated stainless steel tubing surface simultaneously, the roughness of stainless steel ground is improved, provides attachment point for subsequent chemical composition coating and organic coating.Corrugated stainless steel tubing Coating Pretreatment method of the invention, chemical etching and chemical conversion membrane treatment process are matched, and effectively enhance the adhesive force between organic coating and stainless steel ground, improve the qualification rate of corrugated stainless steel tubing coating quality and painting operation.
Description
Technical field
The invention belongs to Metal surface anticorrosion technology fields, and in particular to a kind of chemical etching agent also relates to one kind
Use the corrugated stainless steel tubing Coating Pretreatment method of the chemical etching agent.
Background technique
Corrugated stainless steel tubing is inhaled as a kind of flexible pressure-resistant pipe fitting to compensate the mutual displacement of pipeline or machine, equipment
The effects of receiving vibrational energy, capable of playing vibration damping, noise reduction has flexible, light weight, corrosion-resistant, antifatigue, high-low temperature resistant etc.
Plurality of advantages.
In power switch industry apply more stainless steel material bellows, under normal atmospheric environment, stainless steel it is resistance to
Corrosive power can satisfy product requirement.But in harsh environment, on the way such as coastal area, marine transportation, chloride ion
It is very serious Deng the corrosion to stainless steel, it is necessary to protective coating be carried out to corrugated stainless steel tubing in advance.Currently, to stainless steel-like zero
The anti-corrosion method of part is established on the basis of ordinary carbon steel part anticorrosion process, and specific aim is not strong.
For stainless steel, there are mainly two types of using more Pretreatment Technology Before Finishing, one is mechanical blasting treatment,
Sandblasting can effectively remove stainless steel surface dirt and passivation film, and be formed on its surface rough and uneven in surface, enhancing coating binding force.
In the prior art, patent CN100560798C discloses a kind of acid washing passivation technology for stainless steel, including alkali degreasing, first time water
It washes, sandblasting, second wash, is passivated, third time is washed and drying；Wherein alkali degreasing solution used in alkali degreasing contains hydrogen-oxygen
Change the alkali degreasing solution of sodium, sodium carbonate, sodium phosphate and sodium metasilicate, total concentration is 3wt%-5wt%；Passivation is by workpiece normal
30-60min is impregnated in warm nitric acid+sodium dichromate solution；Sandblasting is in workpiece surface even application white fused alumina or bead.For another example
Li Yonghong etc. is found out suitably in " selection of stainless steel part Pretreatment Technology Before Finishing " (modern coating, 2013) text
Pretreatment Technology Before Finishing, according to the requirement manufacture craft test plate (panel) of ISO 4624, material is SUS 304, and it is blunt to have chosen pickling respectively
Change, degreasing, manual grinding, spray quartz sand, spray 5 kinds of Pretreatment Technology Before Finishings of bead carry out engineer testing；Test result combines
The combined factors of design feature, outer dimension and the existing capacity of equipment of existing product etc. are analyzed, and blasting treatment is taken
Mode is more suitble to existing stainless steelwork.But the mechanical blasting treatment in the above method is for thin wall component discomfort
With；Corrugated stainless steel tubing tube wall is very thin, and mechanical sandblasting is easily deformed.Stainless steel work-piece Pretreatment Technology Before Finishing common second
Kind is chemical conversion film process, generally includes degreasing, two step of chemical conversion film process, such method scope of application is wider, still
For structure is complicated part, there is the halfway situation of processing, cause pull-away after coating.
Corrugated stainless steel tubing used in power industry switchgear is with tube wall is thin, surface passivated membrane is fine and close, structure is multiple
Miscellaneous feature, corrugated portion thickness are only 3mm, and there are the labyrinths such as ripple gap, shrinkage pool, are deposited using mechanical blasting treatment
The problem of ripple deforms.It is larger in its external coating difficulty due to the particularity of corrugated stainless steel tubing structure, while stainless steel
Bellows surface passivating film is fine and close and structure is more complex, and there are the difficult positions such as a large amount of gaps, hole；Chemical conversion is used merely
Film process, there are passivating film removals to be not thorough, conversion film generates the defects of discontinuous, often occurs that adhesive force is unqualified to be caused to paint
The case where film falls off, so that bellows coating quality is poor, repair rate is high.In order to which corrugated stainless steel tubing coating quality is effectively ensured,
How before chemical conversion film process, the passivating film on corrugated stainless steel tubing surface is removed, improves surface roughness, turns chemistry
Change film process and generate continuous film layer, is current urgent problem.
Summary of the invention
The object of the present invention is to provide a kind of chemical etching agent, can effectively remove the passivating film on corrugated stainless steel tubing surface,
Improve surface roughness.
A second object of the present invention is to provide a kind of corrugated stainless steel tubing Coating Pretreatment methods.
In order to achieve the goal above, the technical scheme adopted by the invention is that:
A kind of chemical etching agent, contains following components in percentage by weight: phosphatase 11 %~10%, nitric acid 1%~5%, hydrogen
Fluoric acid 0.2%~1%, citric acid 1%~5%, organic amine corrosion inhibiter 0.5%~1%, potassium chlorate 0.5%~1%.
The mass concentration of the phosphoric acid is 85%；The mass concentration of the nitric acid is 65%~68%；The hydrofluoric acid
Mass concentration is 40%.
In the chemical etching agent, surplus is water.The pH of the chemical etching agent is 2.5~3.5.
The organic amine corrosion inhibiter is the mixture of thiocarbamide and peregal.Wherein, the mass ratio of thiocarbamide and peregal is
0.2~0.6:0.1~0.5.
Chemical etching agent of the invention, mainly by phosphoric acid, nitric acid, hydrofluoric acid, citric acid, organic amine corrosion inhibiter and chloric acid
Potassium compounds, and corrosiveness is moderate；Using the chemical etching agent to stainless steel work-piece especially corrugated stainless steel tubing
Etch processing is learned, can remove the passivating film on corrugated stainless steel tubing surface by the corrosiveness of etching solution, while in stainless steel wave
Line pipe surface causes microcosmic corrosion, improves the roughness of stainless steel ground, provides for subsequent chemical composition coating with organic coating
Attachment point；Meanwhile and excessive erosion will not be caused to corrugated stainless steel tubing, it solves the prior art using mechanical sandblasting and removes surface
Corrugated stainless steel tubing problem on deformation caused by when passivating film, before being suitable for thin-walled or complicated stainless steel work-piece coating
Reason is suitble to promote the use of.
The chemical etching agent uses at normal temperature；It is soaked in use, stainless steel work-piece to be processed is immersed in the chemistry
It loses in agent, soaking time is no more than 20min under room temperature.
A kind of corrugated stainless steel tubing Coating Pretreatment method of above-mentioned chemical etching agent, including the following steps:
1) ungrease treatment is carried out to corrugated stainless steel tubing using degreasing agent, it is rear to wash；
2) chemical etching processing is carried out to corrugated stainless steel tubing using the chemical etching agent, it is rear to wash；
3) chemical conversion film process is carried out to corrugated stainless steel tubing, rear washing, drying are formed on corrugated stainless steel tubing surface
Continuous film layer.
Before ungrease treatment, inner cavity and non-coating surface to corrugated stainless steel tubing carry out masking processing.Corrugated stainless steel tubing
Non- coating surface refer generally to high-precision surface or other do not need the surface of coating.Masking processing can be used electrical adhesive tape and be hidden
It covers；The effect of masking processing is that treatment fluid used in subsequent handling is avoided to cause corruption to the inner cavity of corrugated stainless steel tubing and non-coating surface
Erosion.
In step 1), the degreasing agent contains the component of following concentration: Na2CO310~20g/L, Na3PO4·12H2O 10
~20g/L, Na2SiO310~20g/L, 1~3g/L of emulsifier.In the degreasing agent, surplus is water.
The pH of the degreasing agent is 9~10.The emulsifier is OP-10 emulsifier.
The temperature of the ungrease treatment is 20~60 DEG C, and the time is 5~10min.Ungrease treatment is by corrugated stainless steel tubing
The removal of surface and oil contaminant impurity is clean, guarantee surface without droplet, without discoloration, inviolateness etc..
Washing described in step 1) includes that hot water wash and cold water wash two steps.Washing cleans piece surface remnants degreasing agent dry
Only, guarantee that piece surface is remained without degreasing agent.
The temperature of hot water wash is 80~85 DEG C, and the time is 20s~60s.The temperature of cold washing process is room temperature, time 20s
~60s.
In step 2), the time of the chemical etching processing is 5~20min.Chemical etching processing carries out at normal temperature；It will
Corrugated stainless steel tubing is immersed in the chemical etching agent, and soaking time is no more than 20min under room temperature.Pass through chemical etching agent
Corrosiveness removes the passivating film on corrugated stainless steel tubing surface, while causing microcosmic corrosion in bellows surface, improves substrate
Roughness provides attachment point for subsequent chemical composition coating and organic coating.
In step 3), the chemical conversion film process be corrugated stainless steel tubing impregnates to 10 in conversion coating treating fluid~
25min.Chemical conversion film process carries out at room temperature.It is formed continuously by chemical conversion film process on corrugated stainless steel tubing surface
Film layer guarantees that adhesive force is good between stainless steel ground and coating after coating as the attachment bottom of organic coating.Conversion used
Film process liquid is zirconium rare earth silane epithelium liquid.Preferably, the conversion coating treating fluid is happy and auspicious board XH-69 type zirconium rare earth silicon
Alkane epithelium liquid (Chengdu happy and auspicious Xin Dai coating group).
Corrugated stainless steel tubing Coating Pretreatment method of the invention is the particularity and wave for comprehensively considering stainless steel material
The complexity of line pipe structure, chemical etching and chemical conversion membrane treatment process are matched, proposition more targetedly
Coating Pretreatment method, including degreasing, chemical etching, chemical conversion film process；This method is through chemical etching and chemical composition coating
It handles reasonably combined, on the one hand avoids the deformation that stainless steel thin-wall bellows is generated by mechanical sandblasting, on the other hand avoid
The single existing halfway situation of processing of chemical composition coating processing；Two kinds of processes cooperate, and coordinative role mutually makes up,
Effective adhesive force enhanced between organic coating and stainless steel ground, raising corrugated stainless steel tubing coating quality and painting operation
Qualification rate.
Using corrugated stainless steel tubing Coating Pretreatment method of the invention, after can effectively controlling corrugated stainless steel tubing coating
Adhesive force of the film on stainless steel ground guarantees painting operation quality, can promote corrugated stainless steel tubing coating qualification rate
To 98% or more, avoid the Repair of rejected product, greatly reduce because film adhesive it is unqualified caused by reprocess
Waste.
Specific embodiment
The present invention is further illustrated With reference to embodiment.
Embodiment 1
The chemical etching agent of the present embodiment, consists of the following components in percentage by weight: the phosphoric acid of mass concentration 85%
1%, the nitric acid 5% of mass concentration 65%, the hydrofluoric acid 1% of mass concentration 40%, citric acid 5%, organic amine corrosion inhibiter
0.8%, potassium chlorate 0.5%, surplus are water.The pH of the chemical etching agent is 2.5~3.5.Wherein, the organic amine inhibition
Agent is the mixture of thiocarbamide and peregal；The mass percent of thiocarbamide is 0.5%, the mass percent of peregal is 0.3%.
The corrugated stainless steel tubing Coating Pretreatment method of the present embodiment, including the following steps:
1) it covers: corrugated stainless steel tubing inner cavity and non-coating surface being covered using electrical adhesive tape, it is ensured that processed
Cheng Zhong, treatment fluid cannot immerse inner cavity and non-coating surface causes to corrode；
2) degreasing: ungrease treatment is carried out to corrugated stainless steel tubing using degreasing agent, the temperature of ungrease treatment is 20 DEG C, the time
For 10min, after successively washed through hot water wash, cold water；Check that the removals such as corrugated stainless steel tubing surface and oil contaminant impurity are clean, surface is anhydrous
Pearl, without discoloration, inviolateness etc.；
Wherein, degreasing agent used is grouped as by the group of following concentration: Na2CO310g/L、Na3PO4·12H2O 20g/L、
Na2SiO310g/L, OP-10 emulsifier 1g/L, surplus are water；The pH of the degreasing agent is 9~10；
3) corrugated stainless steel tubing is immersed into the chemical etching agent and carries out chemical etching processing, temperature is room temperature, time
It is rear to wash for 5min；Corrugated stainless steel tubing surface is in dumb light color after etch, and control avoids excessive corrosion；
4) using happy and auspicious board XH-69 type zirconium rare earth silane epithelium liquid (Chengdu happy and auspicious Xin Dai coating group) to stainless steel wave
Line pipe carries out chemical conversion film process, and temperature is room temperature, time 10min, rear washing, drying, on corrugated stainless steel tubing surface
Form continuous conversion film layer.
Epoxy primer and polyurethane finish are successively sprayed on the corrugated stainless steel tubing surface Jing Guo preceding processing, after doing solid work, inspection
At survey ripple, the adhesive force of paint film reaches 0~1 grade at Flange Plane, meets the technical requirements used.
Embodiment 2
The chemical etching agent of the present embodiment, consists of the following components in percentage by weight: the phosphoric acid of mass concentration 85%
5%, nitric acid 3%, the hydrofluoric acid 0.6% of mass concentration 40%, citric acid 3%, organic amine inhibition of the mass concentration for 68%
Agent 0.5%, potassium chlorate 1%, surplus are water.The pH of the chemical etching agent is 2.5~3.5.Wherein, the organic amine inhibition
Agent is the mixture of thiocarbamide and peregal；The mass percent of thiocarbamide is 0.4%, the mass percent of peregal is 0.1%.
The corrugated stainless steel tubing Coating Pretreatment method of the present embodiment, including the following steps:
1) it covers: corrugated stainless steel tubing inner cavity and non-coating surface being covered using electrical adhesive tape, it is ensured that processed
Cheng Zhong, treatment fluid cannot immerse inner cavity and non-coating surface causes to corrode；
2) degreasing: ungrease treatment is carried out to corrugated stainless steel tubing using degreasing agent, the temperature of ungrease treatment is 40 DEG C, the time
For 8min, after successively washed through hot water wash, cold water；Check that the removals such as corrugated stainless steel tubing surface and oil contaminant impurity are clean, surface is anhydrous
Pearl, without discoloration, inviolateness etc.；
Wherein, degreasing agent used is grouped as by the group of following concentration: Na2CO315g/L、Na3PO4·12H2O 15g/L、
Na2SiO320g/L, OP-10 emulsifier 3g/L, surplus are water；The pH of the degreasing agent is 9~10；
3) corrugated stainless steel tubing is immersed into the chemical etching agent and carries out chemical etching processing, temperature is room temperature, time
It is rear to wash for 10min；Corrugated stainless steel tubing surface is in dumb light color after etch, and control avoids excessive corrosion；
4) using happy and auspicious board XH-69 type zirconium rare earth silane epithelium liquid (Chengdu happy and auspicious Xin Dai coating group) to stainless steel wave
Line pipe carries out chemical conversion film process, and temperature is room temperature, time 20min, rear washing, drying, on corrugated stainless steel tubing surface
Form continuous conversion film layer.
Epoxy primer and polyurethane finish are successively sprayed on the corrugated stainless steel tubing surface Jing Guo preceding processing, after doing solid work, inspection
At survey ripple, the adhesive force of paint film reaches 0~1 grade at Flange Plane, meets the technical requirements used.
Embodiment 3
The chemical etching agent of the present embodiment, consists of the following components in percentage by weight: the phosphoric acid of mass concentration 85%
10%, the nitric acid 1% of mass concentration 68%, the hydrofluoric acid 0.2% of mass concentration 40%, citric acid 1%, organic amine corrosion inhibiter
1%, potassium chlorate 0.8%, surplus are water.The pH of the chemical etching agent is 2.5~3.5.Wherein, the organic amine corrosion inhibiter
For the mixture of thiocarbamide and peregal；The mass percent of thiocarbamide is 0.6%, the mass percent of peregal is 0.4%.
The corrugated stainless steel tubing Coating Pretreatment method of the present embodiment, including the following steps:
1) it covers: corrugated stainless steel tubing inner cavity and non-coating surface being covered using electrical adhesive tape, it is ensured that processed
Cheng Zhong, treatment fluid cannot immerse inner cavity and non-coating surface causes to corrode；
2) degreasing: ungrease treatment is carried out to corrugated stainless steel tubing using degreasing agent, the temperature of ungrease treatment is 60 DEG C, the time
For 5min, after successively washed through hot water wash, cold water；Check that the removals such as corrugated stainless steel tubing surface and oil contaminant impurity are clean, surface is anhydrous
Pearl, without discoloration, inviolateness etc.；
Wherein, degreasing agent used is grouped as by the group of following concentration: Na2CO320g/L、Na3PO4·12H2O 10g/L、
Na2SiO315g/L, OP-10 emulsifier 2g/L, surplus are water；The pH of the degreasing agent is 9~10；
3) corrugated stainless steel tubing is immersed into the chemical etching agent and carries out chemical etching processing, temperature is room temperature, time
It is rear to wash for 20min；Corrugated stainless steel tubing surface is in dumb light color after etch, and control avoids excessive corrosion；
4) using happy and auspicious board XH-69 type zirconium rare earth silane epithelium liquid (Chengdu happy and auspicious Xin Dai coating group) to stainless steel wave
Line pipe carries out chemical conversion film process, and temperature is room temperature, time 25min, rear washing, drying, on corrugated stainless steel tubing surface
Form continuous conversion film layer.
Epoxy primer and polyurethane finish are successively sprayed on the corrugated stainless steel tubing surface Jing Guo preceding processing, after doing solid work, inspection
At survey ripple, the adhesive force of paint film reaches 0~1 grade at Flange Plane, meets the technical requirements used.
Using the corrugated stainless steel tubing Coating Pretreatment method of embodiment 1-3, after effectively controlling corrugated stainless steel tubing coating
Adhesive force of the film on stainless steel ground, guarantee painting operation quality, can by corrugated stainless steel tubing coating qualification rate by
94% is promoted to 98% or more, avoids the Repair of rejected product, greatly reduces and makes because film adhesive is unqualified
At reprocess waste.
Claims (8)
1. a kind of chemical etching agent of corrugated stainless steel tubing, it is characterised in that: consist of the following components in percentage by weight: phosphoric acid
1%~10%, nitric acid 1%~5%, hydrofluoric acid 0.2%~1%, citric acid 1%~5%, organic amine corrosion inhibiter 0.5%~1%, potassium chlorate
0.5%~1%, surplus is water；The mass concentration of the phosphoric acid is 85%, and the mass concentration of the nitric acid is 65%~68%, the hydrogen
The mass concentration of fluoric acid is 40%；The organic amine corrosion inhibiter is the mixture of thiocarbamide and peregal, the matter of thiocarbamide and peregal
Amount is than being 0.2~0.6:0.1~0.5；The pH of the chemical etching agent is 2.5~3.5.
2. a kind of corrugated stainless steel tubing Coating Pretreatment method using chemical etching agent as described in claim 1, feature
It is: includes the following steps:
1) ungrease treatment is carried out to corrugated stainless steel tubing using degreasing agent, it is rear to wash；
2) chemical etching processing is carried out to corrugated stainless steel tubing using the chemical etching agent, it is rear to wash；
3) chemical conversion film process is carried out to corrugated stainless steel tubing, rear washing, drying are formed continuously on corrugated stainless steel tubing surface
Film layer.
3. corrugated stainless steel tubing Coating Pretreatment method according to claim 2, it is characterised in that: before ungrease treatment,
Inner cavity and non-coating surface to corrugated stainless steel tubing carry out masking processing.
4. corrugated stainless steel tubing Coating Pretreatment method according to claim 2, it is characterised in that: described in step 1)
Degreasing agent contains the component of following concentration: Na2CO310~20g/L, Na3PO4·12H210~20g/L of O, Na2SiO310~
20g/L, 1~3g/L of emulsifier.
5. corrugated stainless steel tubing Coating Pretreatment method according to claim 4, it is characterised in that: the pH of the degreasing agent
It is 9~10.
6. according to corrugated stainless steel tubing Coating Pretreatment method described in claim 2,4 or 5, it is characterised in that: the degreasing
The temperature of processing is 20~60 DEG C, and the time is 5~10min.
7. corrugated stainless steel tubing Coating Pretreatment method according to claim 2, it is characterised in that: described in step 2
The time of chemical etching processing is 5~20min.
8. corrugated stainless steel tubing Coating Pretreatment method according to claim 2, it is characterised in that: described in step 3)
Chemical conversion film process is that corrugated stainless steel tubing is impregnated to 10~25min in conversion coating treating fluid.
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| CN201510997195.6A CN105603427B (en) | 2015-12-24 | 2015-12-24 | A kind of chemical etching agent and corrugated stainless steel tubing Coating Pretreatment method |
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| CN201510997195.6A CN105603427B (en) | 2015-12-24 | 2015-12-24 | A kind of chemical etching agent and corrugated stainless steel tubing Coating Pretreatment method |
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| CN105603427B true CN105603427B (en) | 2019-01-01 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102220591A (en) * | 2011-07-26 | 2011-10-19 | 扬州华宇管件有限公司 | Pickling and passivating treatment process for stainless steel pipes |
| CN104451640A (en) * | 2014-11-25 | 2015-03-25 | 三达奥克化学股份有限公司 | Surface roughening and conversion coating treatment agent for stainless steel parts before spraying and coating and preparation method of treatment agent |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102220591A (en) * | 2011-07-26 | 2011-10-19 | 扬州华宇管件有限公司 | Pickling and passivating treatment process for stainless steel pipes |
| CN104451640A (en) * | 2014-11-25 | 2015-03-25 | 三达奥克化学股份有限公司 | Surface roughening and conversion coating treatment agent for stainless steel parts before spraying and coating and preparation method of treatment agent |
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