激光熔覆Al-Ni-TiC-CeO<sub>2</sub>复合涂层的组织与耐腐蚀磨损性能

doi:10.11868/j.issn.1001-4381.2018.000274

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摘要

采用激光熔覆技术在S355海洋钢表面制备Al-Ni-TiC-CeO₂熔覆涂层，通过SEM、EDS、XRD、显微硬度计等手段分析其表面-界面形貌、化学元素分布、物相组成及显微硬度，并研究其在3.5%（质量分数）NaCl溶液中耐腐蚀磨损与应力腐蚀开裂（stress corrosion cracking，SCC）等性能。结果表明：熔覆涂层主要由增强相TiC和连续相AlNi₃，AlFe₃组成，表面较为平整，无明显裂纹，稀释率为5%。涂层表面显微硬度达到809.3HV_0.2，为基体的2.3倍。基体中交互作用主要以腐蚀加速磨损为主，而涂层中交互作用则以磨损加速腐蚀为主。基体材料与涂层的SCC敏感性分别为35.01%和17.69%，表明涂层能够明显抑制应力腐蚀开裂。

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	贺星
	孔德军
	宋仁国

关键词 ：激光熔覆, 磨蚀, 应力腐蚀开裂, 复合涂层, S355海洋钢

Abstract：

Al-Ni-TiC-CeO₂ composite coatings were prepared by laser cladding technique on S355 offshore steel.The surface-interface morphologies, chemical element distribution, phase compositions, microhardness of the as-prepared coatings were analyzed by means of scanning electron microscope (SEM), energy dispersive X-ray spectrometer (EDS), X-ray diffractometer (XRD) and microhardness tester. Also, the corrosive wear resistance and stress corrosion cracking (SCC) of the coatings in 3.5%(mass fraction)NaCl solution were studied. The results show that the coating is mainly composed of TiC and AlNi₃ phases as well as AlFe₃ phase. The surface of the coating is relatively smooth, there is no obvious crack, and the dilution rate is 5%. The surface hardness of the coating is 809.3HV_0.2, which is 2.3 times as high as the substrate. The interaction is mainly corrosion accelerating abrasion in the substrate, while it is wear accelerating corrosion in the coating. The SCC susceptibility of the substrate and coating are 35.01% and 17.69% respectively, which indicates that the coating can inhibit the SCC obviously.

Key words： laser cladding corrosive wear stress corrosion cracking composite coating S355 offshore steel

收稿日期: 2018-03-18 出版日期: 2019-10-12

中图分类号:

TG174.44

基金资助:江苏省重点研发计划资助项目(BE2016052)

通讯作者: 宋仁国 E-mail: songrg@hotmail.com

作者简介: 宋仁国(1965-), 男, 教授, 博士, 博士研究生导师, 主要从事材料腐蚀与防护、表面工程、计算材料科学等研究工作, 联系地址:江苏省常州市武进区科教城科教会堂C座340室(213164), E-mail:songrg@hotmail.com

引用本文:

贺星, 孔德军, 宋仁国. 激光熔覆Al-Ni-TiC-CeO₂复合涂层的组织与耐腐蚀磨损性能[J]. 材料工程, 2019, 47(10): 68-75.
Xing HE, De-jun KONG, Ren-guo SONG. Microstructure and corrosion-wear resistance of laser cladding Al-Ni-TiC-CeO₂ composite coatings. Journal of Materials Engineering, 2019, 47(10): 68-75.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2018.000274 或 http://jme.biam.ac.cn/CN/Y2019/V47/I10/68

Fig.1 激光熔覆工艺原理图

Table 1 激光熔覆工艺参数

Fig.2 慢应变速率拉伸试样尺寸示意图

激光熔覆涂层表面XRD图

Fig.4 涂层表面形貌
(a)原始形貌；(b)SEM图；(c)三维形貌

Fig.5 涂层截面形貌及EDS分析结果
(a)SEM图；(b)EDS分析结果；(c)Al元素；(d)Fe元素；(e)Ti元素；(f)Ni元素

Fig.6 涂层截面显微硬度分布(a)与压痕图(b)

Fig.7 涂层与基体的摩擦因数

Fig.8 磨蚀后表面SEM形貌
(a)基体；(b)涂层

Fig.9 基体与涂层在稳态及磨损状态下的动电位极化曲线

Table 2 基体与涂层极化曲线拟合数据

Fig.10 基体与涂层磨蚀交互作用量

Fig.11 基体与涂层应力-应变曲线

Fig.12 基体与涂层的抗拉强度

Fig.13 基体(a)与涂层(b)在空气(1)和3.5%NaCl溶液(2)中的拉伸断口形貌

Fig.14 基体与涂层的氢含量及SCC敏感性

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