| Citation: |
DONG Hongwei, ZHANG Guanxing, DONG Yuanyuan, et al. Influence of silver flux residue on corrosion behavior of Bundy tube[J]. Welding & Joining, 2025（x）：1 − 8. DOI: 10.12073/j.hj.20240610004
|
[Objective] The purpose was to study influence of silver flux residue on corrosion behavior of Bundy tube. [Methods] By means of XRD, stereo-microscope and scanning electron microscope, influence of 308S silver flux residue on corrosion behavior of Bundy tube before and after welding was systematically studied and analyzed. [Results] The results showed that solution of 308S flux with main components of KBF4 and B2O3 was acidic, Zn plating layer on the surface reacted with H+, HF− and F− in the solution to form soluble complex salts, and the rate decreased with the extension of time. In the salt spray corrosion box, due to more H+, F+, Cl− and other active ions, there was an electric potential difference between Zn and Fe elements in Bundy tube and Ag and Cu elements in brazing filler metal, and plating Zn layer on the surface could form a galvanic cell with other metals. Zn substance on the surface was dissolved, it was accompanied by puffy cotton-like ZnO, ZnF2 and other substances. Then, active ions entered the interior along the cracks and aggravated internal corrosion. After Zn plating layer was corroded, the internal Fe and O combined to form FeO, Fe2O3 and other oxides, while it reacted with NaCl to form FeCl3 and other substances to accelerate corrosion, and the overall corrosion joint showed iron red. [Conclusion] After brazing operation, flux residue was highly corrosive, which had an adverse effect on sealing and life of refrigeration and pressure vessel pipelines. Therefore, in order to improve service life of brazed joints, amount of flux should be reduced as much as possible in brazing, it was carefully cleaned and polished after brazing and anti-rust and anti-corrosion treatment should be taken.
| [1] |
王岸林, 谭周芳. 空调器制冷用铜管研究[J]. 家电科技, 2007(2): 39 − 41.
WANG Anlin, TAN Zhoufang. Study of copper tubes used for refrigeration of air-conditioners[J]. Journal of Appliance Science & Technology, 2007(2): 39 − 41.
|
| [2] |
王应民, 洪梅, 韩爱林. 邦迪管完全可替代铜管在制冷系统管路中的应用[J]. 家用电器科技, 2000(11): 44 − 46.
WANG Yingmin, HONG Mei, HAN Ailin. The application of Bundy pipe can completely replace copper pipe in refrigeration system pipeline[J]. Science and Technology of Household Electric Appliance, 2000(11): 44 − 46.
|
| [3] |
王海滨, 乔培新, 唐福庆, 等. 邦迪管钎焊接头的应力腐蚀断裂研究[J]. 焊接, 1998(11): 35 − 38.
WANG Haibin, QIAO Peixin, TANG Fuqing, et al. Stress-corrosion cracking in brazed joint of Band pipe[J]. Welding & Joining, 1998(11): 35 − 38.
|
| [4] |
栾阳, 焦咏翔, 孙奇, 等. 空调制冷铜管腐蚀失效分析[J]. 制冷与空调, 2020, 20(10): 22 − 26.
LUAN Yang, JIAO Yongxiang, SUN Qi, et al. Corrosion failure analysis of copper tubes in refrigerating system of air conditioning[J]. Refrigeration and Air-conditioning, 2020, 20(10): 22 − 26.
|
| [5] |
马宗理, 张金利, 李德富, 等. 空调制冷铜管使用中的若干问题[J]. 制冷与空调, 2003, 3(4): 66 − 70.
MA Zongli, ZHANG Jinli, LI Defu, et al. Some problems of cooper tube using in air conditioning and refrigeration system[J]. Refrigeration and Air-conditioning, 2003, 3(4): 66 − 70.
|
| [6] |
郭沫清. 邦迪管的手工钎焊[J]. 焊接技术, 1998(6): 43.
GUO Moqing. Manual brazing of Bundy pipe[J]. Welding Technology, 1998(6): 43.
|
| [7] |
ZHAO Yue, LONG Weimin, HUANG Sen, et al. Film removal mechanism of FB3-F silver brazing flux[J]. Rare Metal Materials and Engineering, 2021, 50(11): 3857 − 3861.
|
| [8] |
祁冰, 王世明. 基于邦迪管低银钎料的研究[J]. 家电科技, 2017(8): 66 − 67.
QI Bing, WANG Shiming. Research of low-silver brazing filler metal on Bundy tube[J]. Journal of Appliance Science & Technology, 2017(8): 66 − 67.
|
| [9] |
LONG Weimin, LI Shengnan, DU Dong, et al. Morphological evolution and development trend of brazing materials[J]. Rare Metal Materials and Engineering, 2019, 48(12): 3781 − 3790.
|
| [10] |
张雷, 吴铭方, 浦娟, 等. Ag30CuZnSn药芯钎料润湿性及钎缝性能研究[J]. 热加工工艺, 2022, 51(1): 39 − 41.
ZHANG Lei, WU Mingfang, PU Juan, et al. Study on wettability and brazing properties of Ag30CuZnSn flux cored brazing filler metal[J]. Hot Working Technology, 2022, 51(1): 39 − 41.
|
| [11] |
张启运, 庄鸿寿. 钎焊手册[M]. 3版. 北京: 机械工业出版社, 2017: 135-143.
ZHANG Qiyun, ZHUANG Hongshou. Handbooks of brazing and soldering [M]. 3rd edition. Beijing: China Machine Press, 2017: 135-143.
|
| [12] |
ZHAO Yue, LONG Weimin, HUANG Sen, et al. Removal mechanism of oxide film on 304 stainless steel surface by silver brazing flux containing fluoride[J]. Rare Metal Materials and Engineering, 2022, 51(12): 4502 − 4507.
|
| [13] |
伍成根, 张露菁. 银钎剂的改性处理[J]. 焊接, 2002(10): 29 − 31.
WU Chenggen, ZHANG Lujing. The research of modifications for silver brazing fluxes[J]. Welding & Joining, 2002(10): 29 − 31.
|
| [14] |
张露菁, 朱庆华, 顾润南. 银钎剂剖析与制备的研究[J]. 中国纺织大学学报, 1999, 25(1): 98 − 99,107.
ZHANG Lujing, ZHU Qinghua, GU Runnan. Research of silver brazing fluxes in analysis and processing[J]. Journal of China Textile University, 1999, 25(1): 98 − 99,107.
|
| [15] |
张太平, 邵文松. 元素的电离能、电子亲合能、电负性、电极电势四者的联系与区别[J]. 高等函授学报(自然科学版), 2001, 14(6): 15 − 18.
ZHANG Taiping, SHAO Wensong. The relation and difference of ionization energy, electron affinity energy, electronegativity and electrode potential of elements[J]. Journal of Higher Correspondence Education (Natural Sciences), 2001, 14(6): 15 − 18.
|
| [16] |
李淑妮, 崔斌, 唐宗薰. 元素电势图及其应用[J]. 宝鸡文理学院学报(自然科学版), 2001, 21(1): 39 − 44.
LI Shuni, CUI Bin, TANG Zongxun. Element potential diagram and its applications[J]. Journal of Baoji University of Arts and Sciences (Natural Science Edition), 2001, 21(1): 39 − 44.
|
| [17] |
张冠星, 钟素娟, 董媛媛, 等. 焊后钎剂残渣腐蚀行为分析[J]. 焊接, 2022(11): 47 − 53.
ZHANG Guanxing, ZHONG Sujuan, DONG Yuanyuan, et al. Analysis of flux residue corrosion behavior after brazing[J]. Welding & Joining, 2022(11): 47 − 53.
|
Supported by: Beijing Renhe Information Technology Co., Ltd. 
DownLoad: