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Effect of Brazing Alloys with Tin Electroless Plated on Microstructure and Mechanical Properties of Brass Brazed Joints
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North China University of Water Resources and Electric Power,,,State Key Laboratory of Advanced Brazing Filler Metals and Technology,ZRIME,,

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TG454

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    Abstract:

    H62 brass joints were brazed successfully using BAg45CuZn brazing filler metals plated tin coatings. SEM and XRD were used to observe the surface microstructure and phase of tin coatings and H62 brass brazed joint. The tensile strength of H62 brass brazed joints were analyzed using tensile test machine. The results show that the crystallization orientation of tin coating displays (110) and (210) crystal faces. The interface brazing seam and H62 brass produce sound brazed joints after tin electroless plated on filler metal. Then Cu-rich phase in the microstructure of brazed joints decrease, but the Cu5Zn8 intermetallic compound generate. The tensile strength of brazed joints initially increase and then decrease with increasing of plating tin content. When the content of tin electroless plated coating is 6.0 %(wt.%), the maximum tensile strength of brass brazed joints is 353 MPa. The fracture morphology of brazed joints using filler metal with tin coatings display ductile fracture which the same with the joints using the BAg45CuZn brazing filler metal.

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[WangXingxing, Wang Bo, Han Linshan, Long Weimin, Tang Mingqi,. Effect of Brazing Alloys with Tin Electroless Plated on Microstructure and Mechanical Properties of Brass Brazed Joints[J]. Rare Metal Materials and Engineering,2018,47(1):367~370.]
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History
  • Received:October 14,2015
  • Revised:December 01,2015
  • Adopted:December 08,2015
  • Online: February 07,2018
  • Published: