Corrosion Behavior of a Superduplex Stainless Steel in Chloride Aqueous Solution

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.

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Pitting Corrosion Behavior of Sintered SUS444 Stainless Steel in MgCl2 Solution

Materials Science Forum ◽

10.4028/www.scientific.net/msf.539-543.3255 ◽

2007 ◽

Vol 539-543 ◽

pp. 3255-3260 ◽

Cited By ~ 4

Author(s):

Satoshi Sunada ◽

Yusuke Miyazaki ◽

Kazuhiko Majima

Keyword(s):

Aqueous Solution ◽

Stainless Steel ◽

Corrosion Behavior ◽

Pitting Corrosion ◽

Stainless Steels ◽

Corrosion Potential ◽

Corrosion Morphology ◽

Sem Observation ◽

Porosity Ratio

The pitting corrosion behavior of sintered SUS 444 stainless steels (P/M specimens) with different kinds of porosity ratios of 13.3, 9.11 and 6.88 % was studied in an aqueous solution containing MgCl2 compared with a conventionally processed SUS 444 stainless steel(I/M specimen). The pitting corrosion potential decreased almost linearly as porosity ratio increased, and the I/M specimen showed the best resistance against the initiation of pitting corrosion. The pitting corrosion morphology by SEM observation showed that more small pits were observed on the specimen with larger porosity ratio while less number but larger diameter pits were observed on the specimen with smaller porosity ratio, and it was also confirmed that the I/M specimen had the least number but the largest and deepest pits.

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Effect of microstructure on corrosion behavior of superduplex stainless steel at critical environment conditions

Scripta Materialia ◽

10.1016/j.scriptamat.2007.07.037 ◽

2007 ◽

Vol 57 (10) ◽

pp. 913-916 ◽

Cited By ~ 58

Author(s):

Ivan N. Bastos ◽

Sérgio S.M. Tavares ◽

Francis Dalard ◽

Ricardo P. Nogueira

Keyword(s):

Stainless Steel ◽

Corrosion Behavior ◽

Superduplex Stainless Steel ◽

Effect Of Microstructure

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The Pitting Corrosion Behavior of SUS 304 Stainless Steel in HCl/Ethanol and NaCl/Ethanol Aqueous Solution.

Journal of The Surface Finishing Society of Japan ◽

10.4139/sfj.44.998 ◽

1993 ◽

Vol 44 (11) ◽

pp. 998-1003

Author(s):

Yoichiro HIWATASHI

Keyword(s):

Aqueous Solution ◽

Stainless Steel ◽

Corrosion Behavior ◽

Pitting Corrosion ◽

304 Stainless Steel ◽

Ethanol Aqueous Solution

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

Materials Science Forum ◽

10.4028/www.scientific.net/msf.1016.522 ◽

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.

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