CN104018166A - In-service austenitic stainless steel cleaning passivator in marine environment - Google Patents
In-service austenitic stainless steel cleaning passivator in marine environment Download PDFInfo
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- CN104018166A CN104018166A CN201410263568.2A CN201410263568A CN104018166A CN 104018166 A CN104018166 A CN 104018166A CN 201410263568 A CN201410263568 A CN 201410263568A CN 104018166 A CN104018166 A CN 104018166A
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Abstract
The invention belongs to the technical field of material surface treatment and relates to an in-service austenitic stainless steel cleaning passivator in the marine environment. The passivator comprises the following components: nitric acid, hydrochloric acid, polyaspartic acid, citric acid, hydrogen peroxide, sodium polyacrylate, sulfuric acid and hexamethylene amine, wherein 15-20mL of nitric acid, 5-15mL of hydrochloric acid, 2-12g of polyaspartic acid, 2-8g of citric acid, 5-20mL of hydrogen peroxide, 2-5g of sodium polyacrylate, 4-10mL of hexamethylene amine and 2-9mL of sulfuric acid are contained in per 100mL of cleaning passivator. The cleaning passivator is simple in preparation, low in volatility, good in safety and little in environmental pollution and is suitable for site construction.
Description
Technical field:
The invention belongs to surface treatment technology of material field, relate to in-service austenitic stainless steel Cleaning and Passivation agent in the agent of a kind of stainless steel Cleaning and Passivation, particularly a kind of ocean environment.
Background technology:
At present, the austenitic stainless steel using in ocean environment has good corrosion resistance nature, cryogenic mechanics performance, good welding property and processing characteristics, is widely applied at oceanographic engineering, petrochemical industry.Because marine corrosion environment is very harsh, stainless steel still will be in the face of the problem of spot corrosion and sea marine organism pollution in ocean environment use procedure.Easily there is spot corrosion in austenitic stainless steel, even can cause pipe perforation in Seawater environment, and the malicious event that stainless steel equipment directly or indirectly causes because of spot corrosion occurs repeatedly.Therefore austenitic stainless steel is applied in generation and the inhibition that under ocean environment, will pay special attention to spot corrosion, at present, mainly adopt acid wash passivation to carry out Passivation Treatment to stainless steel surface, stainless steel is on active service and is there will be marine life to adhere to and grow in ocean environment, the function of reduction equipment, causes crevice corrosion.Austenitic stainless steel pipe road or equipment are in use due to after other reasons destruction, its in-service security is brought to hidden danger, first, there is spot corrosion in various degree in stainless steel surface, the safety evaluation reusing is brought to risk, there is uncertainty work-ing life, in engineering, occur such situation, can adopt to change to renew; Secondly, under ocean environment, be on active service after for some time, may there is sea marine organism pollution in stainless steel surface, must carry out effective removing to stainless steel surface marine life and just can recycle.If austenitic stainless steel surface is suitably processed, effectively solve above-mentioned two problems, by the security that improves stainless steel pipes and equipment and reenlist, extend stainless steel work-ing life, reduce maintenance cost, increase economic efficiency, cut the waste.
Summary of the invention:
The object of the invention is to overcome the shortcoming that prior art exists, for the problem reenlisting after in-service austenitic stainless steel accidental damage under ocean environment, seek design in-service austenitic stainless steel Cleaning and Passivation agent in a kind of ocean environment is provided, for stainless steel is carried out to surface treatment, realize and destroy stainless steel surface hidden point pit, passivation stainless steel surface and remove effect of surperficial marine life again, reduces maintenance cost, improves material erosion resistance and economic benefit.
To achieve these goals, the component of the Cleaning and Passivation agent the present invention relates to comprises nitric acid, hydrochloric acid, poly aspartic acid, citric acid, hydrogen peroxide, sodium polyacrylate, sulfuric acid and hexa-methylene amine, contains 15-20mL nitric acid, 5-15mL hydrochloric acid, 2-12g poly aspartic acid, 2-8g citric acid, 5-20mL hydrogen peroxide, 2-5g sodium polyacrylate, 4-10mL hexa-methylene amine and 2-9mL sulfuric acid in the agent of every 100mL Cleaning and Passivation; Citric acid and hydrogen peroxide reduce the usage quantity of hydrochloric acid, prevent the destruction of chlorion to passive film in cleaning process, strengthen passivation for stainless steel; The low usage quantity of hydrochloric acid prevents the formation of scavenging solution acid mist in the time cleaning, and reduces injury; Poly aspartic acid can prevent that the oxide compound of iron from depositing again, prevents from forming new destruction source, has slow-release function, also can accelerate the dissolving of marine life calcification structure; The sequestering power of sodium polyacrylate prevents the deposition again of corrosion product in cleaning process; Hexa-methylene amine has slow-release function, the corrosion stainless steel base that prevents that hyper acid.
The Cleaning and Passivation agent the present invention relates to is used within the scope of 20-45 DEG C, and scavenging period is 0.5-2 hour, when cleaning the initial stage rapid, the later stage is slow, is beneficial to and removes fast marine life and destroy hidden point pit early stage, the later stage forms passive film again.
The present invention compared with prior art, can effectively destroy hidden point pit, realizes the raising of stainless passivation again and pitting resistance, and can remove the calcification marine life on austenitic stainless steel surface; Its preparation is simple, and volatility is low, and security is good, and environmental pollution is little, is suitable for site operation, simultaneously cleaning solution.
Brief description of the drawings:
Fig. 1 is the 316L stainless steel schematic diagram that the embodiment of the present invention is used 2 months in marine site, and wherein lower part represents that the marine life of stainless steel surface after cleaning is removed, and upper part is contrast figure.
Fig. 2 is the embodiment of the present invention 2 stainless steel surface hidden point pits after cleaning, and becomes open bowl configurations schematic diagram.
Fig. 3 is stainless steel polarization curve in seawater after clean that the embodiment of the present invention 2 relates to, and pitting potential is brought up to 1260mV (SCE) from 550mV (SCE).
Embodiment:
Below by embodiment, also the invention will be further described by reference to the accompanying drawings.
Embodiment 1:
The combination ingredient of the Cleaning and Passivation agent that the present embodiment relates to comprises nitric acid, hydrochloric acid, poly aspartic acid, citric acid, hydrogen peroxide, sodium polyacrylate, sulfuric acid and hexa-methylene amine, in the agent of every 100mL Cleaning and Passivation, contain 15-20mL nitric acid, 5-15mL hydrochloric acid, 2-12g poly aspartic acid, 2-8g citric acid, 5-20mL hydrogen peroxide, 2-5g sodium polyacrylate, 4-10mL hexa-methylene amine and 2-9mL sulfuric acid, citric acid and hydrogen peroxide reduce the usage quantity of hydrochloric acid, prevent the destruction of chlorion to passive film in cleaning process, strengthen passivation for stainless steel simultaneously; The low formation that prevents scavenging solution acid mist in the time cleaning of low usage quantity of hydrochloric acid, reduces injury; Poly aspartic acid prevents the deposition again of the oxide compound of iron on the one hand, prevents from forming new destruction source, has the function of slowly-releasing simultaneously, accelerates on the other hand the dissolving of marine life calcification structure; The sequestering power of sodium polyacrylate prevents the deposition again of corrosion product in cleaning process; Hexa-methylene amine has slow-release function, the corrosion stainless steel base that prevents that hyper acid; Its product uses within the scope of 20-45 DEG C, and scavenging period is 0.5-2 hour, when cleaning the initial stage rapid, the later stage is slow, is beneficial to and removes fast marine life and destroy hidden point pit early stage, the later stage forms passive film again.
Embodiment 2:
The present embodiment is thrown in sheet 316L austenitic stainless steel in certain marine site, throw in and take out sample after 2 months, surface has occurred stained and has had surface pitting to occur, use the Cleaning and Passivation agent in embodiment 1 at room temperature soak 40 minutes or rinse 20 minutes there is the 316L austenitic stainless steel of spot corrosion, the calcification marine life of stainless steel surface is removed, as shown in Figure 1; By scanning electron microscopic observation stainless steel surface microtexture, find that some pit is destroyed, be transformed into open pit, as shown in Figure 2; Electrochemical analysis shows that stainless steel after treatment, there is passivation in surface, resistance to pitting potential obviously improves, as shown in Figure 2, experimental result shows, the Cleaning and Passivation agent of embodiment 1 can realize and destroy in-service stainless steel surface hidden spot corrosion, passivation stainless steel surface and remove the function of surperficial marine life again.
Claims (2)
1. in-service austenitic stainless steel Cleaning and Passivation agent in an ocean environment, it is characterized in that its component comprises nitric acid, hydrochloric acid, poly aspartic acid, citric acid, hydrogen peroxide, sodium polyacrylate, sulfuric acid and hexa-methylene amine, contains 15-20mL nitric acid, 5-15mL hydrochloric acid, 2-12g poly aspartic acid, 2-8g citric acid, 5-20mL hydrogen peroxide, 2-5g sodium polyacrylate, 4-10mL hexa-methylene amine and 2-9mL sulfuric acid in the agent of every 100mL Cleaning and Passivation; Citric acid and hydrogen peroxide reduce the usage quantity of hydrochloric acid, prevent the destruction of chlorion to passive film in cleaning process, strengthen passivation for stainless steel; The low usage quantity of hydrochloric acid prevents the formation of scavenging solution acid mist in the time cleaning, and reduces injury; Poly aspartic acid can prevent that the oxide compound of iron from depositing again, prevents from forming new destruction source, has slow-release function, also can accelerate the dissolving of marine life calcification structure; The sequestering power of sodium polyacrylate prevents the deposition again of corrosion product in cleaning process; Hexa-methylene amine has slow-release function, the corrosion stainless steel base that prevents that hyper acid.
2. in-service austenitic stainless steel Cleaning and Passivation agent in ocean environment according to claim 1, it is characterized in that using within the scope of 20-45 DEG C, scavenging period is 0.5-2 hour, when cleaning, the initial stage is rapid, later stage is slow, be beneficial to and remove fast marine life and destroy hidden point pit early stage, the later stage forms passive film again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410263568.2A CN104018166A (en) | 2014-06-13 | 2014-06-13 | In-service austenitic stainless steel cleaning passivator in marine environment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410263568.2A CN104018166A (en) | 2014-06-13 | 2014-06-13 | In-service austenitic stainless steel cleaning passivator in marine environment |
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| CN104018166A true CN104018166A (en) | 2014-09-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410263568.2A Pending CN104018166A (en) | 2014-06-13 | 2014-06-13 | In-service austenitic stainless steel cleaning passivator in marine environment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105586603A (en) * | 2015-11-23 | 2016-05-18 | 佛山市高明俊品金属制品有限公司 | Removing method of stainless steel oxide scale |
| CN108441872A (en) * | 2018-03-14 | 2018-08-24 | 南京高威表面技术有限公司 | A kind of anti-austenitic stainless steel Polythionic acid stress corrosion cleaning agent |
Citations (3)
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| JPH11264087A (en) * | 1998-03-16 | 1999-09-28 | Parker Corp | Treating liquid for descaling stainless steel and its usage |
| CN101135056A (en) * | 2007-09-29 | 2008-03-05 | 吴铭鑫 | Stainless steel cleaning agent |
| CN103243340A (en) * | 2013-05-08 | 2013-08-14 | 张文卓 | Stainless steel environment-friendly pickling solution |
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2014
- 2014-06-13 CN CN201410263568.2A patent/CN104018166A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11264087A (en) * | 1998-03-16 | 1999-09-28 | Parker Corp | Treating liquid for descaling stainless steel and its usage |
| CN101135056A (en) * | 2007-09-29 | 2008-03-05 | 吴铭鑫 | Stainless steel cleaning agent |
| CN103243340A (en) * | 2013-05-08 | 2013-08-14 | 张文卓 | Stainless steel environment-friendly pickling solution |
Non-Patent Citations (1)
| Title |
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| 张欢: "氯化钠介质中06Cr19Ni10不锈钢缓蚀剂的研制", 《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》, no. 07, 15 July 2010 (2010-07-15) * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105586603A (en) * | 2015-11-23 | 2016-05-18 | 佛山市高明俊品金属制品有限公司 | Removing method of stainless steel oxide scale |
| CN105586603B (en) * | 2015-11-23 | 2018-10-09 | 佛山市高明俊品金属制品有限公司 | A kind of stainless steel oxidation skin minimizing technology |
| CN108441872A (en) * | 2018-03-14 | 2018-08-24 | 南京高威表面技术有限公司 | A kind of anti-austenitic stainless steel Polythionic acid stress corrosion cleaning agent |
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Application publication date: 20140903 |