盐雾环境对<strong>1Cr18Ni9Ti</strong>钎焊接头的影响研究

doi:10.11902/1005.4537.2022.385

中国腐蚀与防护学报

2023, Vol. 43

Issue (6): 1312-1318 CSTR: 32134.14.1005.4537.2022.385 DOI: 10.11902/1005.4537.2022.385

研究报告

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盐雾环境对1Cr18Ni9Ti钎焊接头的影响研究

廖敏行¹, 刘俊², 董宝军³, 冷雪松¹, 蔡泽伦¹, 武俊伟³, 贺建超¹(

)

^1.哈尔滨工工业大学 (深圳) 特殊环境物质科学研究院深圳 518055
^2.上海空间推进研究所上海 201112
^3.哈尔滨工工业大学 (深圳) 材料科学与工程学院深圳 518055

Effect of Salt Spray Environment on Performance of 1Cr18Ni9Ti Brazed Joint

LIAO Minxing¹, LIU Jun², DONG Baojun³, LENG Xuesong¹, CAI Zelun¹, WU Junwei³, HE Jianchao¹(

)

^1.Institute of Special Environments Physical Sciences, Harbin Institute of Technology, Shenzhen 518055, China
^2.Shanghai Engineering Research Center of Space Engine, Shanghai 201112, China
^3.School of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen 518055, China

引用本文:

廖敏行, 刘俊, 董宝军, 冷雪松, 蔡泽伦, 武俊伟, 贺建超. 盐雾环境对1Cr18Ni9Ti钎焊接头的影响研究[J]. 中国腐蚀与防护学报, 2023, 43(6): 1312-1318.
Minxing LIAO, Jun LIU, Baojun DONG, Xuesong LENG, Zelun CAI, Junwei WU, Jianchao HE. Effect of Salt Spray Environment on Performance of 1Cr18Ni9Ti Brazed Joint[J]. Journal of Chinese Society for Corrosion and protection, 2023, 43(6): 1312-1318.

全文: PDF(8321 KB) HTML

摘要:

采用BNi-2薄带钎料对1Cr18Ni9Ti进行了钎焊，分析了接头的显微组织、电化学特性、硬度和拉伸性能。通过盐雾腐蚀试验，研究了腐蚀过程中接头组织和力学性能的演变。结果表明，1Cr18Ni9Ti钎焊接头成形良好，焊缝两侧的显微硬度明显高于母材。焊接接头的抗拉强度达到500 MPa。接头焊缝的腐蚀电位高于1Cr18Ni9Ti母材，接头在盐雾环境中发生电偶腐蚀。力学性能测试结果表明，未腐蚀的钎焊接头拉伸试验后断裂发生在带有钎料的母材处，断口分析表明，拉伸过程中接头涂有钎料的母材首先形成多道裂纹，然后扩展到母材发生断裂，具有明显的塑性变形。1Cr18Ni9Ti钎焊接头经过盐雾腐蚀后，接头力学性能下降，拉伸试验后断裂发生在钎焊焊缝处，无塑性变形特征。

关键词 ：焊接接头, 钎焊, 电偶腐蚀, 微观组织, 力学性能

Abstract：

1Cr18Ni9Ti is brazed with BNi-2 thin strip filler metal. The microstructure, electrochemical characteristics, and hardness and tensile properties of the joint are assessed. While the evolution of the microstructure and mechanical properties of the joint is examined after salt spray corrosion test. The results show that the 1Cr18Ni9Ti brazed joint is well formed, and the microhardness of the weld is significantly higher than that of the base metal on both sides. The tensile strength of the welded joint reaches 500 MPa. The corrosion potential of the weld seam is higher than that of 1Cr18Ni9Ti base metal, and thus the joint is subject to galvanic corrosion in the salt spray environment. The observation results show that the fracture of the uncorroded brazed joint occurs at the adjacent base metal, and the fracture analysis shows that during tensile process, cracks may firstly initiate at the brazing solder, and then cracks propagate to the base metal, and finally fracture occurs. The fractured surface exhibits obvious features of plastic deformation. After salt spray corrosion test, the mechanical properties of the 1Cr18Ni9Ti brazed joint decreased, and the fracture occurred at the interface of brazed joint/base metal after the tensile test, but without characteristics of plastic deformation.

Key words： welded joints brazing galvanic corrosion microstructure mechanical property

收稿日期: 2022-12-06 32134.14.1005.4537.2022.385

ZTFLH:

TG174

基金资助:深圳市发展和改革委员会专项资金重大科研平台自主攻关领域核心技术攻关和工程化验证项目(202100037)

通讯作者: 贺建超，E-mail: hejianchao@hit.edu.cn，研究方向为海洋腐蚀、焊接构件的服役性能、固相焊接技术研究等

Corresponding author: HE Jianchao, E-mail: hejianchao@hit.edu.cn

作者简介: 廖敏行，男，1998年，硕士生

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https://www.jcscp.org/CN/10.11902/1005.4537.2022.385 或 https://www.jcscp.org/CN/Y2023/V43/I6/1312

表1 1Cr18Ni9Ti合金钎焊接头显微硬度 (HV)

图1 力学性能试样

图2 3种试样在5%NaCl 溶液中测量的 Tafel 极化曲线结果

图3 1Cr18Ni9Ti合金钎焊焊接接头在5%NaCl溶液中的微区电化学结果

图4 1Cr18Ni9Ti合金钎焊试样焊后显微组织

图5 1Cr18Ni9Ti合金钎焊接头元素分布

图6 1Cr18Ni9Ti钎焊接头盐雾腐蚀后的3D形貌

图7 1Cr18Ni9Ti钎焊接头盐雾腐蚀后的高度差

图8 1Cr18Ni9Ti钎焊接头拉伸试样应力-应变曲线

图9 1Cr18Ni9Ti钎焊在腐蚀前、腐蚀10 d和腐蚀20 d时的拉伸样品的宏观形貌

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