| WANG Hongzhe,YANG Deming,ZHAO Zhongjie,GAO Weiqiang,LI Zhengxu.Effect of Substrate Temperature on Wear and Corrosion Resistance of Plasma Sprayed Iron-based Amorphous Coatings[J],53(19):201-211 |
| Effect of Substrate Temperature on Wear and Corrosion Resistance of Plasma Sprayed Iron-based Amorphous Coatings |
| Received:January 12, 2024 Revised:May 24, 2024 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2024.19.019 |
| KeyWord:atmospheric plasma spraying amorphous coatings substrate temperature spreading morphology wear resistance corrosion resistance |
| Author | Institution |
| WANG Hongzhe |
College of Transportation Engineering, Dalian Maritime University, Liaoning Dalian , China |
| YANG Deming |
College of Transportation Engineering, Dalian Maritime University, Liaoning Dalian , China |
| ZHAO Zhongjie |
College of Transportation Engineering, Dalian Maritime University, Liaoning Dalian , China |
| GAO Weiqiang |
College of Transportation Engineering, Dalian Maritime University, Liaoning Dalian , China |
| LI Zhengxu |
College of Transportation Engineering, Dalian Maritime University, Liaoning Dalian , China |
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| Abstract: |
| The work aims to investigate the effect of substrate temperature on the wear and corrosion resistance of iron-based amorphous coatings. The iron-based amorphous coatings were prepared on FeCrAl substrate by atmospheric plasma spraying at three different substrate temperatures (averaging about 90, 380, and 650 ℃), and the spreading morphology of amorphous powder particles at different substrate temperatures was analyzed to investigate the effects of substrate temperature on the amorphous content, oxidation, microhardness, porosity, and phase compositions of the coatings. Then, the tribological properties and the wear and corrosion resistance of the coatings were analyzed under dry sliding conditions of 3, 5, and 9 N loads in 3.0% NaCl solution. The friction mechanism was analyzed and the electrochemical properties of the coatings in 3.5% sodium chloride solution and the corrosion mechanism were investigated. When the substrate temperature was 90 ℃, the splash pattern of amorphous powder particles on the substrate extension was more intense, the coatings at this temperature had the highest amorphous content and the lowest degree of oxidation. When the substrate temperature increased to 380 ℃, the particle splash pattern was round, and at this time, the porosity of the coatings was reduced from 1.54% by 0.64%, the coating of the degree of oxidation increased, the microhardness reached the maximum of 1 001.46HV0.3. When the substrate temperature increased to 650 ℃, the particle spattering morphology changed from disc shape to ellipse shape, the branches at the edge of the particles became thicker and longer, the oxidation degree of the coatings was the most serious, the porosity of the coatings increased to 0.89%, and the microhardness decreased to 940HV0.3. In terms of wear resistance, the coating with 86.7% amorphous content prepared at 380 ℃ had the smallest porosity, the highest microhardness and the lowest specific wear rate under 3, 5 and 9 N load, and the degree of spalling was small, mainly because the substrate temperature reduced the amorphous content while reducing the porosity and increasing the microhardness, and the fine crystal reinforcement played a role in wear resistance. The wear mechanism was mainly oxidative wear, supplemented by adhesive wear. The coating prepared at 380 ℃ also showed the lowest Jcorr (3.39×10−6 A/cm2) in 3.5% NaCl solution, which was mainly attributed to the fact that the coating prepared at 380 ℃ had the lowest porosity, which was not easy to provide erosion channels for corrosive media during the corrosion process and reduced the pitting of the coating. The effect of low porosity to improve the corrosion resistance of the coating will be weakened with the reduction of the amorphous phase content of the coating and the increase of the oxide. Compared with low and high substrate temperatures, the coatings prepared at medium substrate temperature (about 380 ℃) have better wear and corrosion resistance at the same time, which provides a theoretical basis for the preparation of high-performance amorphous coatings. |
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