Effect of Ce addition on the precipitation of deleterious phases and the associated intergranular corrosion resistance of 27Cr–7Ni hyper duplex stainless steels

2015 ◽  
Vol 90 ◽  
pp. 313-322 ◽  
Author(s):  
Soon-Hyeok Jeon ◽  
Do Haeng Hur ◽  
Hye-Jin Kim ◽  
Yong-Soo Park
Keyword(s):  
Corrosion Resistance ◽  
Stainless Steels ◽  
Intergranular Corrosion ◽  
Duplex Stainless Steels ◽  
Intergranular Corrosion Resistance

Effect of Boron Distribution on the Intergranular Corrosion Resistance of UNS S32506 Duplex Stainless Steels

2019 ◽  
Vol 166 (13) ◽  
pp. C375-C381 ◽  
Author(s):  
Takayuki Takei ◽  
Murotsune Yabe ◽  
Azusa Ooi ◽  
Eiji Tada ◽  
Atsushi Nishikata
Keyword(s):  
Corrosion Resistance ◽  
Stainless Steels ◽  
Intergranular Corrosion ◽  
Duplex Stainless Steels ◽  
Boron Distribution ◽  
Intergranular Corrosion Resistance

The Effect of Boron on the Corrosion Resistance of Austenitic Stainless Steels

CORROSION ◽  
1977 ◽  
Vol 33 (11) ◽  
pp. 408-417 ◽  
Author(s):  
F. P. A. ROBINSON ◽  
W. G. SCURR
Keyword(s):  
Corrosion Resistance ◽  
Stainless Steels ◽  
Intergranular Corrosion ◽  
Detrimental Effect ◽  
Austenitic Stainless Steels ◽  
The Other ◽  
Beneficial Effects ◽  
Identical Series ◽  
Type 304 ◽  
Intergranular Corrosion Resistance

Abstract Two Type 304 stainless steels, one boron free and the other containing 4 ppm boron were investigated. Both steels were subjected to an identical series of corrosion tests and the results compared with one another. It was found (1) Boron had no detrimental effect on the potentiostatic characteristics, intergranular corrosion “resistance and pitting resistance of the steels in the “as-received” condition; (2) boron in solid solution had no detrimental effect on the potentiostatic characteristics and intergranular corrosion resistance of the steel, while boron in solution had a beneficial effect on the pitting resistance of the steel, and (3) boron retarded Cr23C6 precipitation and thus boron had marked beneficial effects on the intergranular corrosion resistance of the steels in a sensitized condition. In addition the potentiostatic characteristics and pitting resistance of such steels were improved slightly by the presence of boron.

The Effect of Trace Boron on Corrosion Resistance of the Casted 0.04C-16Cr Ferritic Stainless Steels in H2SO4 Medium

2012 ◽  
Vol 476-478 ◽  
pp. 263-268 ◽  
Author(s):  
Tie Ming Guo ◽  
Ding Cang Zhang ◽  
Chang Song Han ◽  
Zhi Hui ◽  
Li Ming Zhao
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Polarization Curve ◽  
Current Density ◽  
Stainless Steels ◽  
Intergranular Corrosion ◽  
General Corrosion ◽  
Ferritic Stainless Steels ◽  
Curve Method ◽  
Intergranular Corrosion Resistance

Three groups of 0.04C-16Cr ferritic stainless steels, with boron quality score of 0ppm, 16ppm and 26ppm, were smelted by a vacuum induction furnace. The chemical soak method, the tafel polarization curve method and the anode circular polarization curve method were used to research their general corrosion and intergranular corrosion resistance. The results showed that both general corrosion and intergranular corrosion of the casted 0.04C-16Cr ferritic stainless steels happened in dilute H2SO4 medium. The resuluts of electrochemical and chemical soak indicate that the addition of B improves intergranular corrosion resistance of 0.04C-16Cr stainless steel, moreover, the intergranular corrosion resistance increases with an increasing content of B. The addtion of B makes the general corrosion rate and self-corrosion current density of the 0.04 C-16Cr stainless steel reduced at active dissolution region in dilute sulphuric acid medium, so the general corrosion resistance of the 0.04 C-16Cr stainless steel is improved. The blunt-dimensional current density of the steel with 26ppm B is the lowest and the passivation zone of it is wider, so the stability of passive film and protection capacity of the steel with 26ppm B are the best. The electrochemical characteristics of general corrosion coincided with the results of soak corrosion.

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