CN103255365A - Corrosion and wear resistant coating for magnesium alloy surface and preparation method of corrosion and wear resistant coating - Google Patents
Corrosion and wear resistant coating for magnesium alloy surface and preparation method of corrosion and wear resistant coating Download PDFInfo
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- CN103255365A CN103255365A CN2013101929504A CN201310192950A CN103255365A CN 103255365 A CN103255365 A CN 103255365A CN 2013101929504 A CN2013101929504 A CN 2013101929504A CN 201310192950 A CN201310192950 A CN 201310192950A CN 103255365 A CN103255365 A CN 103255365A
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Abstract
The invention provides a corrosion and wear resistant coating for a magnesium alloy surface and a preparation method of the corrosion and wear resistant coating, and belongs to the field of thermal spraying of material processing engineering. The corrosion and wear resistant coating is an Al-FeAl composite coating formed in a way that a FeAl coating is compounded on an Al bottoming layer. The preparation method comprises the following steps of: cleaning and roughening the magnesium alloy surface; and then depositing the Al-FeAl composite layer on the surface in an electric arc spraying way. The composite coating prepared by the preparation method is able to provide a coating with high resistance to corrosion and wear to the magnesium alloy surface; the composite coating has low cost, is hardly affected by the environment, and can reach the purposes of resource conservation, practicability, feasibility, and small effects of the environment, as well as the purpose of expanding the applicable scope of magnesium alloy.
Description
Technical field
The invention belongs to the field of thermal spray in the Materials Processing Engineering, the technology that relates to a kind of Mg alloy surface deposition NEW TYPE OF COMPOSITE coating, utilize cheap arc spraying technology, the material of cheapness and suitable processing parameter to prepare coating wear-resisting and that corrosion resisting property is more excellent at Mg alloy surface, industrial circles such as wear-resisting, anti-corrosion are mainly used in this invention.
Background technology
In light weight, easy recovery that magnesium alloy has, specific tenacity height, electromagnetic shielding, be easy to advantages such as mechanical workout, be described as " 21 century green engineering material ", but because the chemical property of magnesium is active, electropotential is lower, can produce galvanic corrosion with most of metals, cause the corrosion resistance nature of magnesium and magnesium alloy relatively poor.
Usually some surfacecti proteon means of employing improve the corrosion resistance nature of magnesium alloy, as methods such as thermospray, laser melting coating, galvanic deposit, differential arc oxidations.Develop the treatment process of relevant magnesium alloy chromaking conversion film as U.S. Dow Chemical Company, but owing to contained Cr in the chromate treating technology
6+Ion has toxicity, contaminate environment, and the processing cost height of waste liquid, and people had also explored Chrome-free chemical conversion membrane treatment process afterwards, as phosphate layer etc.; But the wear resistance of chemical conversion film, solidity to corrosion are not so good, and it can only slow down corrosion speed, can not effectively prevent corrosion.The relatively environmental protection of laser modified method, but its facility investment is bigger, rete preparation cost height.The organism coating is to improve an important method of anticorrosion, moistureproof, the heat-resisting and insulating property of magnesium alloy product.But independent organism corrosion resistance coating can be limited, and bonding force is also lower, can only be used as the protective treatment of short period of time, perhaps in other conversion film surface applied as compound coating.
In recent years, applied research on magnesium alloy surface protective has given more concern to people to surperficial hot-spraying techniques, studies show that this is a kind of efficient height, relatively low, the environmental protection of cost, and the good magnesium alloy surface treatment of barrier propterty, good application prospects had.
The Fe-Al series intermetallic compound is with low cost, and its resistance to high temperature oxidation, heat/corrosion resistance and stainless steel are suitable.And electric arc spraying is the surface protection technique of lower cost in the hot-spraying techniques, and spraying temperature is relatively low, and the production efficiency height is easy to operate, the energy utilization rate height.During thermospray, employing Al is transition layer, and the electropotential that prevents the FeAl layer is crossed over against Mg alloy surface and impacted, and improves the bonding properties of FeAl layer and AZ31 matrix simultaneously.
Summary of the invention
The present invention is intended to improve on the basis of Mg alloy surface corrosion-proof wear performance, reduces the cost of preparation protective layer.Utilize cheap arc spraying technology and material, the Al-FeAl compound coating of preparation Al prime coat layer.
A kind of Mg alloy surface corrosion-proof wear coating is characterized in that, is to be compounded with the formed Al-FeAl compound coating of FeAl coating on the Al prime coat layer.
The preparation method of above-mentioned a kind of Mg alloy surface corrosion-proof wear coating adopts arc spray process, at first in Mg alloy surface depositing Al coating, and then deposition FeAl coating.
The preparation method of above-mentioned a kind of Mg alloy surface corrosion-proof wear coating adopts arc spraying technology, it is characterized in that, comprises the steps:
Step 1, magnesium alloy matrix surface is carried out pre-treatment: matrix surface after acetone cleans, to matrix surface sandblast alligatoring, air pressure 0.2-0.4MPa, brown corundum granularity is 60 orders;
Aluminium wire material diameter is preferably 2.0mm in the step 2.
FeAl powder cored filament material in the step 3, adopt purity greater than 99%, granularity 100-200 purpose Al powder is sandwich layer, is crust with the mild-carbon steel strip, FeAl powder cored filament material diameter is preferred 2.00mm; Filling ratio is not less than 17%.
The prepared compound coating of the present invention can provide one deck corrosion-proof wear performance good coating at Mg alloy surface, and simultaneously with low cost, environmental influence is little, and it is little to reach resources conservation, practical, environmental influence, expands the purpose of magnesium alloy usage range simultaneously.
Description of drawings
Fig. 1 embodiment 1 surperficial XRD figure spectrum;
Fig. 2 embodiment 1 section S EM photo;
1 is the AZ31 matrix, and 2 is that Al coating, 3 is the FeAl coating.
The galvanic corrosion anodic polarization curves of Fig. 3 embodiment 1, AZ31 and AZ31 spray Al sample;
Embodiment
Further illustrate substantive distinguishing features of the present invention and remarkable advantage below by embodiment, protection scope of the present invention is not limited to the embodiment that states.
Embodiment 1
1. to adopt Al silk material be commercially available purity greater than the solid silk material of 99% diameter 2.0mm in spraying;
2. the preparation of FeAl powder cored filament material among the embodiment: it is that 12 * 0.3mm(width is 12mm that crust is selected specification for use, thickness is 0.3mm) mild-carbon steel strip, silk material drug core component is purity greater than 99% Al powder, and granularity is the 100-200 order, drawing and by the road tube reducing to 2.0mm; Filling ratio is 20%.
3. select for use magnesium alloy AZ31 as matrix, after acetone cleans, carry out the sandblast alligatoring, air pressure is 0.4MPa, and brown corundum granularity is 60 orders;
4. at AZ31 surface arcing spraying Al layer, processing parameter setting is: voltage 28V, electric current 100A, atomization air pressure 0.55MPa; Every all over spray time 15s, spray and obtain about 200 microns of coat-thickness for 5 times;
5. at the surface arcing spraying FeAl of depositing Al layer layer, processing parameter setting is: voltage 32V, electric current 180A, atomization air pressure 0.6MPa; Every all over spray time 15s, spray and obtain about 800 microns of coat-thickness for 20 times.
The surperficial XRD figure spectrum of embodiment as shown in Figure 1; The microcosmic microstructure of embodiment as shown in Figure 2, as can be seen from the figure, between AZ31 base layer and Al layer, Al layer and the FeAl layer in conjunction with good.
The prepared coating performance detection of embodiment and result are as described below:
1. the prepared coating of embodiment is carried out the micro-hardness testing test, test parameter is: adopt the digital microhardness tester of HXD-1000, load 100g, time length 15s, get 10 microhardness mean values, test result shows that the microhardness of AZ31 base layer is 65HV
0.1, spray Al layer microhardness is 41HV
0.1, and the hardness of FeAl layer has reached 250HV
0.1, be 4 times of AZ31 base layer;
2. the prepared coating of embodiment is carried out the abrasive wear experiment, test parameter is: adopt the wheeled grain-abrasion testing machine of MLS-225 type damp sand rubber, load 100N, rubber wheel rotating speed 240r/min, abrasive material are the quartz sand of 0.2mm～0.4mm, pre-grinding 1000r, be weighing on the BS224S type electronic balance of 0.1mg in precision, as weight before the mill, correct grinding 2000r, weighing is mill back weight again, and abrasion loss is the poor of wearing and tearing front and back weight.With AZ31 sample as a comparison, AZ31 wear weight loss amount is 3 times of embodiment in the experiment, and namely the relative wear resistance of embodiment is 3 times of AZ31.
3. the embodiment coatings prepared is carried out electrochemical corrosion test, test parameter is: adopt the PARSTAT2273 electrochemical workstation, electrolytic solution is the NaCl solution of 3.5wt%, is working electrode with the sample to be tested, working area 2cm
2, counter electrode is platinum electrode, reference electrode is Ag, the AgCl/KCl electrode.Open circuit voltage is the stationary value that surpasses the voltage behind the 2h test duration, and anodic polarization curves begins scanning, sweep velocity 1mv/s from the following 500mv of open circuit voltage., anodic polarization curves such as Fig. 3 of AZ31 matrix, AZ31 spray Al and embodiment.Table 1 is the corrosion potential of AZ31 matrix, AZ31 spray Al and embodiment and from corrosion electric current density, and the relative AZ31 matrix of the corrosion potential of the embodiment 305mV that shuffles reduces about 1 order of magnitude from corrosion electric current density.
Table 1
Claims (7)
1. a Mg alloy surface corrosion-proof wear coating is characterized in that, is to be compounded with the formed Al-FeAl compound coating of FeAl coating on the Al prime coat layer.
2. the method for a kind of Mg alloy surface corrosion-proof wear coating of preparation claim 1 is characterized in that, adopts arc spray process, at first in Mg alloy surface depositing Al coating, and then deposition FeAl coating.
3. according to the described method for preparing Mg alloy surface corrosion-proof wear coating of claim 2, it is characterized in that, may further comprise the steps:
Step 1, magnesium alloy matrix surface is carried out pre-treatment: matrix surface after acetone cleans, to matrix surface sandblast alligatoring, air pressure 0.2-0.4MPa, brown corundum granularity is 60 orders;
Step 2 adopts electric arc spraying process to prepare the Al prime coat layer, uses purity greater than the commercially available fine aluminium silk material of 99wt%, and spraying Al coat-thickness is not less than 200 μ m; Spraying parameter is: voltage 28-30V; Electric current 100-120A; Spray distance: 200-250mm; Compressed air pressure: 0.5-0.6MPa;
Step 3 adopts electric arc technology in Al prime coat layer surface preparation FeAl coating, uses the FeAl powder cored filament material; Spraying FeAl layer thickness is not less than 800 μ m; Spraying parameter is set at: voltage 30-32V; Electric current 180-200A; Spray distance: 200-250mm; Compressed air pressure: 0.6-0.65Mpa.
4. according to the method for claim 3, it is characterized in that aluminium wire material diameter is preferably 2.0mm in the step 2.
5. according to the method for claim 3, it is characterized in that, FeAl powder cored filament material in the step 3, adopt purity greater than 99%, granularity 100-200 purpose Al powder is sandwich layer, is crust with the mild-carbon steel strip, FeAl powder cored filament material diameter is preferably 2.00mm.
6. according to the method for claim 3, it is characterized in that, FeAl powder cored filament material in the step 3, filling ratio is not less than 17%.
7. according to the method for claim 3, it is characterized in that spraying Al layer thickness is preferably 200 μ m in the step 2; Spraying FeAl layer thickness is preferably 800 μ m in the step 3.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106498336A (en) * | 2016-11-18 | 2017-03-15 | 无锡明盛纺织机械有限公司 | A kind of wear resistant corrosion resistant magnesium alloy and preparation method thereof |
| CN106544615A (en) * | 2016-11-18 | 2017-03-29 | 无锡明盛纺织机械有限公司 | A kind of wear resistant corrosion resistant gradient coating magnesium alloy and preparation method thereof |
| CN108677187A (en) * | 2018-06-18 | 2018-10-19 | 中北大学 | Magnesium-based composite material and preparation method thereof based on multi-heat source cladding |
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| CN101994077A (en) * | 2010-10-27 | 2011-03-30 | 江苏科技大学 | High-temperature oxidation resisting intermetallic compound coating and preparation method thereof |
| CN102392208A (en) * | 2011-12-13 | 2012-03-28 | 广州有色金属研究院 | Method for spraying aluminum coating on surface of magnesium alloy |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101994077A (en) * | 2010-10-27 | 2011-03-30 | 江苏科技大学 | High-temperature oxidation resisting intermetallic compound coating and preparation method thereof |
| CN102392208A (en) * | 2011-12-13 | 2012-03-28 | 广州有色金属研究院 | Method for spraying aluminum coating on surface of magnesium alloy |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106498336A (en) * | 2016-11-18 | 2017-03-15 | 无锡明盛纺织机械有限公司 | A kind of wear resistant corrosion resistant magnesium alloy and preparation method thereof |
| CN106544615A (en) * | 2016-11-18 | 2017-03-29 | 无锡明盛纺织机械有限公司 | A kind of wear resistant corrosion resistant gradient coating magnesium alloy and preparation method thereof |
| CN108677187A (en) * | 2018-06-18 | 2018-10-19 | 中北大学 | Magnesium-based composite material and preparation method thereof based on multi-heat source cladding |
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