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| Seawater Erosion-Corrosion Resistance of Ni-based Composite Coatings by Laser Cladding |
| Received:October 15, 2018 Revised:April 25, 2019 |
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| DOI：10.7643/ issn.1672-9242.2019.04.022 |
| KeyWord:laser cladding Ni-based composite coating erosion-corrosion resistance mechanism electro-chemical property |
| Author | Institution |
| LI Shou-biao |
1. SunRui Marine Environment Engineering Co., Ltd, Qingdao , China |
| WAN Ming-qi |
2. Offshore Oil Engineering Co., Ltd, Tianjin , China |
| SHEN Liang |
2. Offshore Oil Engineering Co., Ltd, Tianjin , China |
| SHI Jing |
3. School of Materials Science and Engineering, Ocean University of China, Qingdao , China |
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| Abstract: |
| Objective To analyze corrosion resistance of coating under dynamic corrosion conditions. Methods The Ni- based composite coating was deposited on 40 Cr steels by laser cladding. The real marine environment was simulated to have washout test on the Ni-based coating and analyze the coupling effect of the external force, for instance the seawater impact, particle wear on the corrosion resistance of coating. The self-made 360° rotary scouring machine was selected to study the influences of erosion velocity and sediment concentration on the corrosion resistance of coating. The microstructure after erosion corrosion was observed by optical microscope, the weight loss and electrochemical property were also discussed. Results When the sediment concentration was 3%, the corrosion time was 48 h, the corrosion resistance sequence at different rotational speeds was 300 r/min > 600 r/min > 900 r/min. The corrosion resistance sequence at different rotational speeds was 300 r/min > 900 r/min > 600 r/min after 96-hour corrosion. It became 300 r/min > 900 r/min > 600 r/min after 144-hour of corrosion. At the circumstance of 600 r/min rotational speed and absence of sand, the weight was almost unchanged, and even increased slightly as the corrosion time varied from 48 h to 144 h; Whereas significant weight loss occurred at 3% sediment concentration, particularly, the weight loss increased to 73.71 g/m2 when the erosion time reached 144 h. Conclusion When the sediment concentration must be, and the erosion rate is low, mainly by the electrochemical corrosion effect is given priority to, improve the speed, the corrosion rate was accelerated. When the rotation speed must be corrosion rate increased. In the case of high sediment concentration, the corrosion situation slow down a bit. |
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