K444合金表面CVD渗铝涂层在750 ℃空气中耐NaCl腐蚀行为

doi:10.11902/1005.4537.2022.129

中国腐蚀与防护学报

2023, Vol. 43

Issue (2): 321-328 CSTR: 32134.14.1005.4537.2022.129 DOI: 10.11902/1005.4537.2022.129

中国腐蚀与防护学报编委、青年编委专栏

本期目录 | 过刊浏览

K444合金表面CVD渗铝涂层在750 ℃空气中耐NaCl腐蚀行为

刘姝妤, 耿树江(

), 马艺萌, 王金龙, 王福会

东北大学沈阳材料科学国家研究中心东北大学联合研究分部沈阳 110819

Corrosion Resistance of K444 Alloy without and with CVD Aluminized Coatings Beneath NaCl Deposit in Air at 750 ℃

LIU Shuyu, GENG Shujiang(

), MA Yimeng, WANG Jinlong, WANG Fuhui

Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, China

全文: PDF(30735 KB) HTML

摘要:

采用化学气相沉积 (CVD) 法在镍基高温合金K444表面制备了渗铝涂层。850、950和1050 ℃制备的涂层均为双层结构，外层是NiAl相，内层为互扩散区。涂层随沉积温度升高而增厚，3个沉积温度制备的CVD渗铝涂层厚度分别约为6.2、12.5和30.3 μm。研究了K444合金及3个温度制备的CVD渗铝涂层在750 ℃ NaCl+Air条件下的腐蚀行为。结果表明，K444合金表面发生氧化和氯化反应，腐蚀严重。而CVD渗铝涂层表面生成了保护性Al₂O₃，抗NaCl腐蚀能力增强，1050 ℃沉积温度下制备的CVD渗铝涂层抗腐蚀能力最强。

关键词 ：镍基高温合金, CVD渗铝涂层, NaCl腐蚀

Abstract：

Aluminized coatings were prepared on high temperature alloy K444 by chemical vapor deposition (CVD) at 850, 950 and 1050 ℃, respectively. All the prepared coatings are two layered structure, the outer layer is NiAl phase, and the inner layer is interdiffusion zone. The thickness of the aluminized coating increases with the increase of deposition temperature. The thickness of the aluminized coating prepared at three deposition temperatures is 6.2, 12.5 and 30.3 μm, respectively. The corrosion behavior of K444 alloy without and with CVD aluminized coatings beneath NaCl deposit in air at 750 ℃ was studied. The results show that the bare K444 alloy is seriously corroded by oxidation and chlorination due to the presence of NaCl. However, a protective Al₂O₃ scale is formed on the surface of the CVD aluminized coatings, and thus their corrosion resistance is enhanced. The CVD aluminized coating prepared at 1050 ℃ has the strongest corrosion resistance.

Key words： nickel-based superalloy CVD aluminized coating NaCl corrosion

收稿日期: 2022-04-28 32134.14.1005.4537.2022.129

ZTFLH:

TG172

基金资助:国家重点研发计划(2020YFB2010404)

作者简介: 刘姝妤，女，1999年生，硕士生

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引用本文:

刘姝妤, 耿树江, 马艺萌, 王金龙, 王福会. K444合金表面CVD渗铝涂层在750 ℃空气中耐NaCl腐蚀行为[J]. 中国腐蚀与防护学报, 2023, 43(2): 321-328.
LIU Shuyu, GENG Shujiang, MA Yimeng, WANG Jinlong, WANG Fuhui. Corrosion Resistance of K444 Alloy without and with CVD Aluminized Coatings Beneath NaCl Deposit in Air at 750 ℃. Journal of Chinese Society for Corrosion and protection, 2023, 43(2): 321-328.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2022.129 或 https://www.jcscp.org/CN/Y2023/V43/I2/321

图1 不同沉积温度制备的CVD渗铝涂层SEM截面形貌及EDS元素面分布

图2 3种温度沉积的CVD渗铝涂层的XRD谱

图3 K444合金及其CVD渗铝涂层在750 ℃-NaCl+Air条件下的腐蚀动力学

图4 K444合金在750 ℃-NaCl+Air条件下腐蚀1和10 h的SEM截面形貌及EDS元素面分布

图5 K444合金在750 ℃-NaCl+Air环境下腐蚀后表面腐蚀产物的XRD谱

图6 不同沉积温度制备的CVD渗铝涂层在750 ℃-NaCl+Air条件下腐蚀1 h的SEM截面及EDS元素面分布

图7 不同沉积温度制备的CVD渗铝涂层在750 ℃-NaCl+Air条件下腐蚀1 h的XRD谱

图8 不同沉积温度制备的CVD渗铝涂层在750 ℃-NaCl+Air条件下腐蚀10 h的SEM截面及EDS元素面分布

图9 不同沉积温度制备的CVD渗铝涂层在750 ℃-NaCl+Air条件下腐蚀10 h的XRD谱

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