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304不銹鋼表面納米鋁改性有機硅涂層的高溫氧化和電化學行為

2021-04-19 13:52:05 作者：杜瑤來源：材料研究學報分享至：

304不銹鋼表面納米鋁改性有機硅涂層的高溫氧化和電化學行為

杜瑤, 王成, 朱圣龍, 王福會

1. 中國科學院金屬研究所金屬腐蝕與防護實驗室沈陽 110016

2. 中國科學技術大學材料科學與工程學院沈陽 110016

3. 沈陽材料科學國家研究中心沈陽 110016

4. 東北大學材料科學與工程學院沈陽 110819

High Temperature Oxidation and Electrochemical Corrosion Behavior of Al Nano-particle Modified Silicone Coating on 304 Stainless Steel

DU Yao, WANG Cheng, ZHU Shenglong, WANG Fuhui

1. Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

2. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China

3. Shenyang National Laboratory for Materials Science, Shenyang 110016, China

4. School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China

摘要

研究了納米鋁改性有機硅高溫涂層的固化、抗650℃高溫氧化性能和耐3.5% NaCl水溶液電化學腐蝕性能。當聚氨酯：有機硅的質量分數達到1:3或更高時，有機硅涂料可以在24 h內完成常溫固化。制備出的納米鋁改性有機硅高溫涂層表面致密，沒有微觀裂紋等缺陷。納米鋁改性的有機硅涂層顯著提高了304不銹鋼抗氧化性能，經1028 h氧化實驗，基體幾乎沒有發生氧化，涂層沒有出現開裂和剝落。納米鋁改性的有機硅涂層還顯著提高了氧化后的304不銹鋼耐氯化鈉水溶液腐蝕性能，無涂層的304不銹鋼氧化后形成的氧化膜低頻阻抗僅3.2 Ω·cm2，而涂裝涂層的不銹鋼的低頻阻抗約為1.1×105 Ω·cm2。

關鍵詞：材料失效與保護 ; 耐高溫氧化 ; 納米改性 ; 有機硅 ; 常溫固化 ; 304不銹鋼

Abstract

Al nano-particle modified organosilicone coatings were prepared on stainless steel 304SS. The curing properties at room temperatures, high temperature oxidation behavior at 650?C in air and electrochemical corrosion behavior in 3.5% NaCl solution of the coatings were investigated. The silicone coatings can be cured at room temperatures in 24 h only when the mass ratio of polyurethane over silicone is equal to or higher than 1:3. The as-prepared silicone coatings were smooth and free of cracks. The high temperature oxidation resistance of 304SS was greatly improved by applying the modified silicone coating. After oxidized for 1028 h at 650?C in air, the oxide scale on the coated 304SS was hardly discernable, while the coatings remained intact and free of cracks. Besides, after high temperature oxidation, the electrochemical corrosion resistance of the 304SS coated with modified silicone coating in NaCl solution was greatly improved, too. Without the protection of the coating, the impedance at low frequency of oxidized 304SS without coating was as low as 3.2 Ω·cm2, while that of the sample with coating was as high as 1.1×105 Ω·cm2.

Keywords： failure and protection of materials ; anti-high temperature oxidation ; nano-modification ; organosilion ; normal temperature curing ; 304 stainless steel