Brazing of Stainless Steel Using Electrolytic Ni-P Plating Film and Investigation of Corrosion Behavior

2021 ◽  
Vol 1016 ◽  
pp. 522-527
Author(s):  
Anna Hashimoto ◽  
Shu Bin Liu ◽  
Ikuo Shohji ◽  
Tatsuya Kobayashi ◽  
Junichiro Hirohashi ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Stainless Steel ◽  
Heat Exchanger ◽  
Cross Section ◽  
Corrosion Behavior ◽  
Joint Strength ◽  
Filler Metal ◽  
Microstructural Observation ◽  
Brazed Joint ◽  
Alloy Plating

Electrodeposited Ni-11 mass%P alloy plating film was fabricated on the surface of stainless steel SUS304 to conduct brazing of SUS304 plates for a heat exchanger. Brazing of SUS304 plates with electrodeposited Ni-11P layers was carried out using a hydrogen reducing furnace. The microstructure and joint strength of the brazed joint were also investigated. From the result of the microstructural observation of the cross section of the joint, it was found that the brazing filler metal is homogeneously distributed without defects such as voids between the SUS304 plates. The results of electrochemical measurements showed that the P-concentrated phase in the Ni-11P alloy is preferentially dissolved in NaCl aqueous solution.

Corrosion Resistance Evaluation of a Stainless-Steel Brazed Joint in HCl Solution

2021 ◽  
Vol 1016 ◽  
pp. 997-1002
Author(s):  
Hikaru Nagata ◽  
Masa Ono ◽  
Yasuyuki Miyazawa ◽  
Yuji Hayashi ◽  
Yoshio Bizen
Keyword(s):  
Aqueous Solution ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Base Metal ◽  
Corrosion Behavior ◽  
Anodic Polarization ◽  
Filler Metal ◽  
Brazed Joint ◽  
In Situ Observations

To clarify the effect of the acid solution type on corrosion resistance, the corrosion behavior of stainless steel brazed joints in HCl aqueous solution was evaluated through electrochemical measurements. Anodic polarization curves of a ferritic stainless-steel base metal, Ni-based brazing filler metals, and a brazed joint were recorded. In addition, in situ observations were conducted to observe the corrosion behavior of each structure of the brazed joint. Corrosion potentials of the brazing filler metal were lower than that of the base metal. In situ observations of the brazed joint revealed the order of corrosion in aqueous hydrochloric acid. According to the electrochemical measurements, under an actual corrosive environment, the brazing filler metal can function as an anode and selectively corrode. In addition, the anodic polarization curve of the brazed joint showed values between those of the polarization curves of the brazing filler metal and the base metal, indicating that the corrosion resistance could be electrochemically evaluated in HCl aqueous solution.

scholarly journals Micro-Brazing of Stainless Steel Using Ni-P Alloy Plating

2019 ◽  
Vol 9 (6) ◽  
pp. 1094
Author(s):  
Shubin Liu ◽  
Ikuo Shohji ◽  
Makoto Iioka ◽  
Anna Hashimoto ◽  
Junichiro Hirohashi ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Shear Strength ◽  
Solid Solutions ◽  
Joint Strength ◽  
Filler Metal ◽  
Average Shear Strength ◽  
Average Shear ◽  
Brazed Joints ◽  
Brazed Joint ◽  
Alloy Plating

A Ni-P plated layer of 20 μm thickness containing 11 wt.% P was formed on the surface of a stainless steel (SUS304) plate by electroplating. The microstructure and joint strength of the brazed joint with the electroplated Ni-11P layer were investigated. The results indicated that the filler metal was homogeneously distributed between the SUS304 plates and no voids or flaws formed in the brazed filler zone. Fe-Ni-Cr solid solutions were formed at the brazed interface. Moreover, P was mainly concentrated in such brazed filler zone to form P-containing phases. The average shear strength of the brazed joints was determined to be 47.3 MPa. The results demonstrated that the brazing of SUS304 plates using the electroplated Ni-11P layer as the filler metal was successfully realized.

scholarly journals Corrosion Behavior of Nickel-based Brazing Filler Metal for Stainless Steel Heat Exchanger

2019 ◽  
Vol 9 (3) ◽  
pp. 127-132
Author(s):  
Yusuke FUKAI ◽  
Ikuo SHOHJI ◽  
Tatsuya KOBAYASHI ◽  
Tetsuya ANDO ◽  
Takuya YOSHIDA ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Heat Exchanger ◽  
Corrosion Behavior ◽  
Filler Metal ◽  
Stainless Steel Heat ◽  
Steel Heat

scholarly journals Development of Low Silver AgCuZnSn Filler Metal for Cu/Steel Dissimilar Metal Joining

Metals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 198 ◽  
Author(s):  
Peng Xue ◽  
Yang Zou ◽  
Peng He ◽  
Yinyin Pei ◽  
Huawei Sun ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Shear Strength ◽  
Penetration Depth ◽  
Aging Process ◽  
Filler Metal ◽  
Aging Treatment ◽  
304 Stainless Steel ◽  
Dissimilar Metal ◽  
Brazed Joints ◽  
Brazed Joint

The microstructure and properties of a Cu/304 stainless steel dissimilar metal joint brazed with a low silver Ag16.5CuZnSn-xGa-yCe braze filler after aging treatment were investigated. The results indicated that the addition of Ce could reduce the intergranular penetration depth of the filler metal into the stainless steel during the aging process. The minimum penetration depth in the Ag16.5CuZnSn-0.15Ce brazed joint was decreased by 48.8% compared with the Ag16.5CuZnSn brazed joint. Moreover, the shear strength of the brazed joint decreased with aging time while the shear strength of the AgCuZnSn-xGa-yCe joint was still obviously higher than the Ag16.5CuZnSn joint after a 600 h aging treatment. The fracture type of the Ag16.5CuZnSn-xGa-yCe brazed joints before aging begins ductile and turns slightly brittle during the aging process. Compared to all the results, the Ag16.5CuZnSn-2Ga-0.15Ce brazed joints show the best performance and could satisfy the requirements for cost reduction and long-term use.

scholarly journals Brazed Joint Strength of Stainless Steel with Nickel Base Filler Metals

1979 ◽  
Vol 43 (11) ◽  
pp. 1001-1007 ◽  
Author(s):  
Ichiro Kawakatsu ◽  
Tadashi Osawa ◽  
Haruhisa Saito
Keyword(s):  
Stainless Steel ◽  
Joint Strength ◽  
Brazed Joint ◽  
Nickel Base ◽  
Filler Metals

Mechanism of Void Formation during Brazing of Ni Paste Brazing Filler Metal

2021 ◽  
Vol 1016 ◽  
pp. 1218-1222
Author(s):  
Mana Sakai ◽  
Tatsuya Sasaki ◽  
Yasuyuki Miyazawa
Keyword(s):  
Stainless Steel ◽  
Filler Metal ◽  
Void Formation ◽  
Inert Atmosphere ◽  
Exhaust Gas ◽  
Vacuum Atmosphere ◽  
Brazed Joint ◽  
Egr Cooler ◽  
Debinding Process ◽  
Gas Recirculation

Automobiles are equipped with EGR (Exhaust Gas Recirculation) coolers to improve fuel economy and exhaust gas suppression performance. Inside the EGR cooler, the moisture in the gas is condensed by cooling the hot exhaust gas. This condensed water is highly corrosive because sulfur oxides dissolve. Therefore, stainless steel and Ni-based brazing metal having excellent corrosion resistance are used for the EGR cooler.Until now, stainless steel has been brazed under a vacuum atmosphere. However, there are increasing opportunities to braze stainless steel in an inert atmosphere gas at atmosphere for cost reduction and mass production. In this case, a paste-type brazing filler metal consisted of a powder brazing filler metal and a binder is used. As is well known, a debinding process that volatilizes the binder is needed. From previous research in this laboratory, it is clarified that the binder causes voids. In addition, it is said that the size and location of voids generated at the brazed joint affect the product performance. On the other hand, the detailed investigation about the influence which the installation position of a paste type brazing filler metal on the void formation process has not yet been made. Therefore, in this study, the arrangement method and influence on heating rate and debinder temperature on void formation were investigated by X-ray CT.

Brazing Incoloy 800 Using the MBF-51 Filler Foil

2014 ◽  
Vol 936 ◽  
pp. 1620-1623 ◽  
Author(s):  
Wen Shiang Chen ◽  
Ren Kae Shiue
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Shear Strength ◽  
Heat Exchanger ◽  
Plate Heat Exchanger ◽  
High Corrosion Resistance ◽  
Plate Heat ◽  
Incoloy 800 ◽  
Brazed Joint ◽  
Brazed Plate Heat Exchanger

The purpose of this research is focused on developing a reliable plate heat exchanger made by Incoloy 800 (IN-800) alloy featured with high corrosion resistance in order to replace the current Cu brazed plate heat exchanger made by the 316 stainless steel. A Ni-based filler, MBF-51, was applied to braze the plate heat exchanger made by IN-800. According to the brazing optimizing experiments, the successful brazed joint was made by brazing at 1170 °C for 1800 s. Better shear strength is achieved from the specimen brazed at 1120 °C for 1800 s.

Sign in / Sign up

Export Citation Format

Share Document