CN104611706A - Corrosion inhibition treatment method for magnesium alloy in sodium chloride solution - Google Patents
Corrosion inhibition treatment method for magnesium alloy in sodium chloride solution Download PDFInfo
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- CN104611706A CN104611706A CN201510085879.9A CN201510085879A CN104611706A CN 104611706 A CN104611706 A CN 104611706A CN 201510085879 A CN201510085879 A CN 201510085879A CN 104611706 A CN104611706 A CN 104611706A
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Abstract
The invention discloses a corrosion inhibition treatment method for a magnesium alloy in a sodium chloride solution. The method comprises the following steps: sanding the magnesium alloy with waterproof abrasive paper, washing with water, carrying out oil removal at 70-80 DEG C in an alkaline oil removal solution, carrying out ultrasonic cleaning in 70-80-DEG C deionized water, washing with water, and blow-drying for later use, wherein the alkaline oil removal solution is composed of 30-50 g/L sodium phosphate, 10-20 g/L sodium silicate and 30-50 g/L sodium carbonate; preparing a 1-5 ml/L triethanolamine water solution, and magnetically stirring at 25 DEG C for 0.5 hour; and immersing the treated magnesium alloy in a triethanolamine water solution at 25 DEG C for 0.5-3 hours, taking out, washing with deionized water 2-3 times, and blow-drying, thereby completing the corrosion inhibition treatment of the magnesium alloy. The method is efficient and cheap, can well enhance the corrosion resistance of the magnesium alloy in the sodium chloride solution, and can not pollute the environment and equipment.
Description
Technical field
The invention belongs to metal material surface corrosion and protection field, particularly a kind of Corrosion inhibition treatment method being applicable to magnesium alloy in sodium chloride solution.
Background technology
Magnesium alloy is widely used in many Application Areass such as automobile, electronics, chemical industry, metallurgy, communication, aviation owing to having much excellent performance.But due to the electropotential very negative (-2.36V) of MAGNESIUM METAL, its poor solidity to corrosion greatly limit its application, the solidity to corrosion improving magnesium alloy is one of key solving magnesium alloy application bottleneck.Method at present for Mg alloy surface anti-corrosive treatment mainly contains: chemical transformation, chemical nickel plating, anodic oxidation, organic coating, slow corrosion treatment etc.In numerous anticorrosive methods, inhibiter is known by people already as a kind of economic, practical method.Inhibiter technology does not change the performance of metal itself, is the corrosion protection method that a kind of technique is simple, with low cost, suitability is strong, fully develops talents, be widely used in multiple fields in resources.The inhibiter being applicable to magnesium alloy is at present relatively less, and for different media, the inhibiter that is suitable for also be different.Wherein magnesium alloy is its important Application Areas as pipe applications in wet environment, sodium chloride solution is a kind of corrosive medium of harshness, to serious corrosion be there is in not surface treated magnesium alloy in sodium chloride solution, to efficient, the environment-friendly type inhibiter research of magnesium alloy in sodium chloride solution, the Application Areas of expansion magnesium alloy is had great importance.Trolamine, owing to containing lone-pair electron and atom N in its molecular structure, is easy to produce absorption at interface, takes on the role of inhibiter.Therefore, the application proposes to study the Corrosion inhibition treatment method being applicable to magnesium alloy in a kind of sodium chloride solution.Improve the corrosion resisting property of magnesium alloy, solve the protection bottleneck problem of restriction magnesium alloy application.
Summary of the invention
The object of this invention is to provide a kind of Corrosion inhibition treatment method being applicable to magnesium alloy in sodium chloride solution.
Concrete steps are:
(1) magnesium alloy is polished step by step with the resistance to silicon carbide paper of 600#, 800#, 1000# successively, washing, then oil removing 10 ~ 20 minutes at 70 ~ 80 DEG C in alkaline degreasing liquid, then the deionized water for ultrasonic ripple cleaning 5 ~ 15 minutes of 70 ~ 80 DEG C, washing, dries up for subsequent use; Described alkaline degreasing liquid formula is: sodium phosphate 30 ~ 50g/L, water glass 10 ~ 20g/L, sodium carbonate 30 ~ 50g/L.
(2) compound concentration is the trolamine aqueous solution of 1 ~ 5 ml/L, and 25 DEG C of lower magnetic forces stir 0.5 hour, the transparent shape of solution.
(3) magnesium alloy after step (1) being processed immerses in step (2) gained solution, soak at 25 DEG C after 0.5 ~ 3 hour and take out, deionization washes 2 ~ 3 times to remove the solution of remained on surface, dry up the magnesium alloy that rear acquisition surface has trolamine adsorption layer, namely complete the slow corrosion treatment of magnesium alloy.
Described sodium phosphate, water glass, sodium carbonate and trolamine are chemical pure and above purity.
The inventive method cost is low, and preparation technology is simple, efficiently, cheapness, the Mg alloy surface rete after slow corrosion treatment is complete, has comparatively low corrosion current density and comparatively high electrochemical impedance, the solidity to corrosion of magnesium alloy in sodium chloride solution can be improved preferably, and environment and equipment are not polluted.
Accompanying drawing explanation
Fig. 1 is the SEM figure of Mg alloy surface after slow corrosion treatment in the embodiment of the present invention.
Fig. 2 is the polarization curve of magnesium alloy after slow corrosion treatment in the embodiment of the present invention.
Fig. 3 is the alternating-current impedance figure of magnesium alloy after slow corrosion treatment in the embodiment of the present invention.
Embodiment
embodiment:
(1) the AZ91 magnesium alloy being of a size of 30mm × 20mm × 3mm is polished step by step with the resistance to silicon carbide paper of 600#, 800#, 1000# successively, oil removing 20 minutes at 70 DEG C in alkaline degreasing liquid after washing, 15 minutes are cleaned again at the deionized water for ultrasonic ripple of 70 DEG C, washing, dries up for subsequent use.Described alkaline degreasing liquid formula is: sodium phosphate 40g/L, water glass 15g/L, sodium carbonate 40g/L.
(2) prepare the trolamine aqueous solution that 100 ml concentration are 1 ml/L, 25 DEG C of lower magnetic forces stir 0.5 hour, the transparent shape of solution.
(3) magnesium alloy after step (1) being processed immerses in step (2) gained solution, soak at 25 DEG C after 1 hour and take out, deionization washes 2 times to remove the solution of remained on surface, dry up the magnesium alloy that rear acquisition surface has trolamine adsorption layer, namely complete the slow corrosion treatment of magnesium alloy.
Described sodium phosphate, water glass, sodium carbonate and trolamine are chemical pure.
Superficial film through the magnesium alloy of the present embodiment slow corrosion treatment is shown by SEM, defines the complete protective cover of one deck at Mg alloy surface.
Polarization curve and alternating-current impedance are one of electrochemical means commonly used in corrosion science, are the effective tools of the covering metal electrode erosion rate such as research rete, coating, conversion film.The test of electrochemistry corrosion resisting property is carried out to trolamine protective cover, adopt three-electrode system, magnesium alloy sample is working electrode, and platinum electrode is supporting electrode, saturated calomel electrode (SCE) is reference electrode, mass percent concentration be 1% NaCl solution be corrosive medium.The useful area that magnesium alloy exposes in corrosive medium is 1 cm
2.Polarization curve scanning is carried out to it and obtains result as Fig. 2.Can find out from Fig. 2, the corrosion potential of Mg alloy surface trolamine protective cover is-1.35 V, and corrosion electric current density is 6.05 × 10
-7acm
-2, its corrosion potential, than corrosion potential-1.48 V without the magnesium alloy of slow corrosion treatment, there occurs and shuffles, and corrosion electric current density is than the corrosion electric current density 3.15 × 10 without the magnesium alloy of slow corrosion treatment
-5acm
-2, reduce two orders of magnitude.In addition, alternating-current impedance performance test is adopted to obtain result as Fig. 3 to magnesium alloy.Can find out from Fig. 3, the electrochemical impedance value of Mg alloy surface trolamine protective cover is 5.44 × 10
3Ω cm
2, than the electrochemical impedance value 1.14 × 10 of the magnesium alloy without slow corrosion treatment
3Ω cm
2, increase about 5 times, illustrate that magnesium alloy all shows good corrosion resisting property after the slow corrosion treatment of the present embodiment in sodium chloride solution.
Claims (1)
1. in sodium chloride solution, be applicable to a Corrosion inhibition treatment method for magnesium alloy, it is characterized in that concrete steps are:
(1) magnesium alloy is polished step by step with the resistance to silicon carbide paper of 600#, 800#, 1000# successively, washing, then oil removing 10 ~ 20 minutes at 70 ~ 80 DEG C in alkaline degreasing liquid, then the deionized water for ultrasonic ripple cleaning 5 ~ 15 minutes of 70 ~ 80 DEG C, washing, dries up for subsequent use; Described alkaline degreasing liquid formula is: sodium phosphate 30 ~ 50g/L, water glass 10 ~ 20g/L, sodium carbonate 30 ~ 50g/L;
(2) compound concentration is the trolamine aqueous solution of 1 ~ 5 ml/L, and 25 DEG C of lower magnetic forces stir 0.5 hour, the transparent shape of solution;
(3) magnesium alloy after step (1) being processed immerses in step (2) gained solution, soak at 25 DEG C after 0.5 ~ 3 hour and take out, deionization washes 2 ~ 3 times to remove the solution of remained on surface, dry up the magnesium alloy that rear acquisition surface has trolamine adsorption layer, namely complete the slow corrosion treatment of magnesium alloy;
Described sodium phosphate, water glass, sodium carbonate and trolamine are chemical pure and above purity.
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| CN201510085879.9A CN104611706A (en) | 2015-02-21 | 2015-02-21 | Corrosion inhibition treatment method for magnesium alloy in sodium chloride solution |
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| CN201510085879.9A CN104611706A (en) | 2015-02-21 | 2015-02-21 | Corrosion inhibition treatment method for magnesium alloy in sodium chloride solution |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105331977A (en) * | 2015-09-28 | 2016-02-17 | 西南交通大学 | Method for constructing nanometer containing structure on surface of magnesium metal and coating functional molecules |
| CN107447212A (en) * | 2017-06-02 | 2017-12-08 | 上海航天设备制造总厂 | The surface treatment method of magnesium alloy parts |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010045657A1 (en) * | 2008-10-17 | 2010-04-22 | Battelle Memorial Institute | Corrosion resistant primer coating |
| CN103556149A (en) * | 2013-11-06 | 2014-02-05 | 桂林理工大学 | Corrosion inhibition treatment method for inhibiting corrosion of magnesium alloy in sodium chloride solution |
-
2015
- 2015-02-21 CN CN201510085879.9A patent/CN104611706A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010045657A1 (en) * | 2008-10-17 | 2010-04-22 | Battelle Memorial Institute | Corrosion resistant primer coating |
| CN103556149A (en) * | 2013-11-06 | 2014-02-05 | 桂林理工大学 | Corrosion inhibition treatment method for inhibiting corrosion of magnesium alloy in sodium chloride solution |
Non-Patent Citations (2)
| Title |
|---|
| 陆群等: "《表面处理技术教程》", 31 January 2011, 高等教育出版社 * |
| 魏刚等: "《热水锅炉防腐阻垢技术》", 31 March 2002, 化学工业出版社 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105331977A (en) * | 2015-09-28 | 2016-02-17 | 西南交通大学 | Method for constructing nanometer containing structure on surface of magnesium metal and coating functional molecules |
| CN105331977B (en) * | 2015-09-28 | 2018-01-23 | 西南交通大学 | Nanometer dressing structure and the method for coating functional molecular are built in magnesium based metal |
| CN107447212A (en) * | 2017-06-02 | 2017-12-08 | 上海航天设备制造总厂 | The surface treatment method of magnesium alloy parts |
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Application publication date: 20150513 |
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