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Film Removal Mechanism of FB3-F Silver Brazing Flux
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1.State Key Laboratory of Advanced Brazing Filler Metals and Technology, Zhengzhou Research Institute of Mechanical Engineering Co., Ltd, Zhengzhou 450001, China;2.China Innovation Academy of Intelligent Equipment (Ningbo) Co., Ltd, Ningbo 315700, China

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Fund Project:

National Natural Science Foundation of China (U2004186); Special Support Project for Major Scientific and Technological Innovation in Zhengzhou (2019CXZX0065)

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    Abstract:

    The film removal mechanism of FB3-F silver brazing flux consisting of H3BO3, K2B4O7, and KF with the mass ratio of 7:10:3 was studied. Results show that K2B4O7 or KF cannot individually remove the oxide film on Q235 steel at 700 °C, and KF even accelerates the oxidation rate of steel surface at high temperature. H3BO3 can remove the oxide film at 700 °C, but the product possesses an obvious amorphous structure feature and poor fluidity. Furthermore, H3BO3 can react with KF at 700 °C, and the reaction product can remove the oxide film. Similarly, K2B4O7 can react with KF, but the product is hard. The mixture solder consisting of H3BO3, K2B4O7, and KF can react with the oxide film on surface of Q235 steel plate, and the reaction product presents obvious amorphous feature. The addition of KF transforms the nonreactive H3BO3-K2B4O7 binary system into the reactive KF-H3BO3-K2B4O7 ternary system at 700 °C. KF shows no corrosivity and promotes the removal of oxide film of steel plates in this ternary system.

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[Zhao Yue, Long Weimin, Huang Sen, Zhong Sujuan, Shen Yuanxun, Wang Luyi. Film Removal Mechanism of FB3-F Silver Brazing Flux[J]. Rare Metal Materials and Engineering,2021,50(11):3857~3861.]
DOI:10.12442/j. issn.1002-185X.20210231

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History
  • Received:March 19,2021
  • Revised:April 08,2021
  • Adopted:May 13,2021
  • Online: November 25,2021
  • Published: November 24,2021