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Cavitation and electrochemical characteristics of thermal spray coating with sealing material

Transactions of Nonferrous Metals Society of China 2013年第4期23卷 1002-1010页

作者： Seong-Jong KIM Seung-Jun LEE In-Ju KIM Seong-Kweon KIM Min-Su HAN Seok-Ki JANG Division of Marine Engineering Mokpo Maritime UniversityHaeyangdaehak-ro 91 Mokpo-Si530-729Korea Korea Institute of Industrial Technology 89 Yangdaegiro-gilIpjang-myeonSeobuk-guCheonan-Si331-822Korea Department of Electronic IT Media Engineering Seoul National University of Science & Technology138 Gongneung-gilNowon-gu Seoul139-743Korea

Steel applied in ocean environment is exposed to corrosion and cavitation and is subject to increasing damages. To prevent this, anti-corrosion thermal spray coating technique is widely used. The low-temperature thermal spray coating was performed with 85%Al-14.5%Zn-0.5%Zr for ship materials and various sealing materials were applied to improve its durability, and the electrochemical behavior and cavitation characteristics were observed. The results show that the sealing improves all the properties of the materials. Hybrid ceramic and fluoro-silicon sealing materials show good electrochemical characteristics, and the fluoro-silieon sealing material shows the best anti-cavitation characteristics.

关键词： thermal spray coating sealing material cavitation electrochemical characteristics

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Effects of F-Si sealer on electrochemical characteristics of 15%Al-85%Zn alloy thermal spray coating

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Transactions of Nonferrous Metals Society of China 2011年第12期21卷 2798-2804页

作者： Seong-Jong KIM Seung-Jun LEE Division of Marine System Engineering Mokpo Maritime University

Most hulls of the ships are protected with paintings, sacrificial anode, and impressed current cathodic protection methods against corrosion problems. However, these conventional methods are not very effective because the rudder of ships stern are exposed to very severe corrosive environment such as tides, speeds of ships, cavitations and erosion corrosion. The environmental factors such as cavitation and corrosion will cause damage for materials with the shock wave by the creation and destruction of bubble. To solve these problems, the cavitation and electrochemical experiments are executed for thermal spray coating with Al-Zn alloy wire material. Thereafter, and sealed specimens with F-Si sealer on Al-Zn alloy coated specimen are executed to improve electrochemical and anti-cavitation characteristics in sea water. The application of fluorine silicon sealing after spray coating of 15%Al-85%Zn seems to be appropriate not only in static environment but also in dynamic environment.

关键词： cavitation Al-Zn alloy wire material thermal spray coating corrosion

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Theoretical design and experimental verification of high-entropy carbide ablative resistant coating

Advanced Powder Materials

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Advanced Powder Materials 2024年第5期3卷 11-22页

作者： Lingxiang Guo Shiwei Huang Wei Li Junshuai Lv Jia Sun Science and Technology on Thermostructural Composite Materials Laboratory Shaanxi Key Laboratory of Fiber Reinforced Light Composite MaterialsNorthwestern Polytechnical UniversityXi'an710072China

Composition design of high-entropy carbides is a topic of great scientific interest for the hot-end parts in the aerospace field.A novel theoretical method through an inverse composition design route,*** ensuring the oxide scale with excellent anti-ablation stability,is proposed to improve the ablation resistance of the highentropy carbide *** this work,the(Hf_(0.36)Zr_(0.24)Ti_(0.1)Sc_(0.1)Y_(0.1)La_(0.1))C1-δ(HEC)coatings were prepared by the inverse design concept and verified by the ablation resistance *** linear ablation rate of the HEC coatings is1.45μm/s,only 4.78%of the pristine HfC coatings after the oxyacetylene ablation at 4.18 MW/*** HEC possesses higher toughness with a higher Pugh's ratio of 1.55 in comparison with HfC(1.30).The in-situ formed dense(Hf_(0.36)Zr_(0.24)Ti_(0.1)Sc_(0.1)Y_(0.1)La_(0.1))O2-δoxide scale during ablation benefits to improve the anti-ablation performance attributed to its high structural adaptability with a lattice constant change not exceeding 0.19%at 2000-2300℃.The current investigation demonstrates the effectiveness of the inverse theoretical design,providing a novel optimization approach for ablation protection of high-entropy carbide coatings.

关键词： High-entropy ceramic Theoretical design thermal spray coating Ablation resistance First-principles calculation

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