scholarly journals Corrosion Properties of Cr27Fe24Co18Ni26Nb5 Alloy in 1 N Sulfuric Acid and 1 N Hydrochloric Acid Solutions

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 5924
Author(s):  
Chun-Huei Tsau ◽  
Po-Min Chen
Keyword(s):  
Sulfuric Acid ◽  
Hydrochloric Acid ◽  
Corrosion Potential ◽  
Corrosion Current ◽  
High Entropy Alloy ◽  
Acid Solutions ◽  
Corrosion Properties ◽  
High Entropy ◽  
Hydrochloric Acid Solutions ◽  
Fcc Phase

The composition of the Cr27Fe24Co18Ni26Nb5 high-entropy alloy was selected from the FCC phase in a CrFeCoNiNb alloy. The alloy was melted in an argon atmosphere arc-furnace, followed by annealing in an air furnace. The dendrites of the alloy were in the FCC phase, and the eutectic interdendrites of the alloy comprised HCP and FCC phases. The microstructures and hardness of this alloy were examined; the results indicated that this alloy was very stable. This microstructure and hardness of the alloy almost remained the same after annealing at 1000 °C for 24 h. The polarization behaviors of Cr27Fe24Co18Ni26Nb5 alloy in 1 N sulfuric acid and 1 N hydrochloric acid solutions were measured. Both the corrosion potential and the corrosion current density of the Cr27Fe24Co18Ni26Nb5 alloy increased with increasing test temperatures. The activation energies of the Cr27Fe24Co18Ni26Nb5 alloy in these two solutions were also calculated.

Optical Microscopy Studies of Anodic Dissolution of Iron In Sulfuric and Hydrochloric Acid Solutions

CORROSION ◽  
1968 ◽  
Vol 24 (4) ◽  
pp. 90-95 ◽  
Author(s):  
L FELLONI ◽  
G. P. CAMMAROTA
Keyword(s):  
Sulfuric Acid ◽  
Hydrochloric Acid ◽  
Grain Orientation ◽  
Competitive Adsorption ◽  
Armco Iron ◽  
Water Molecules ◽  
Dissolution Mechanism ◽  
Acid Solutions ◽  
Hydrochloric Acid Solutions ◽  
Sulfuric Acid Solutions

Abstract Microscopical observation was made during and after intensiostatic polarization of Armco iron electrodes. A correlation between etching degree and grain orientation was evident in sulfuric acid solutions. In hydrochloric acid solutions a smoothing at the inside of the grains, independently of their orientation and preferential corrosion at the boundaries occurred. It is suggested that in sulfuric acid the dissolution mechanism involving anion participation may be effective, while in hydrochloric solutions a competitive adsorption very probably takes place between Cl− and OH− or water molecules.

Inhibitory effect of Pistacia khinjuk aerial part extract for carbon steel corrosion in sulfuric acid and hydrochloric acid solutions

2019 ◽  
Vol 74 (6) ◽  
pp. 1799-1815 ◽  
Author(s):  
Nasrin Soltani ◽  
Nahid Tavakkoli ◽  
Abdolmohammad Attaran ◽  
Batoul Karimi ◽  
Maryam Khayatkashani
Keyword(s):  
Sulfuric Acid ◽  
Carbon Steel ◽  
Hydrochloric Acid ◽  
Aerial Part ◽  
Steel Corrosion ◽  
Inhibitory Effect ◽  
Acid Solutions ◽  
Hydrochloric Acid Solutions ◽  
Pistacia Khinjuk

A Novel High-Entropy Alloy AlMgZnSnPbCuMnNi with Low Free Corrosion Potential

2013 ◽  
Vol 327 ◽  
pp. 103-107 ◽  
Author(s):  
Zhang Hua Gan ◽  
Li Ming Xu ◽  
Zhi Hong Lu ◽  
Huan Hua Zhou ◽  
Chun Hui Song ◽  
...  
Keyword(s):  
Anode Material ◽  
Corrosion Potential ◽  
Corrosion Current ◽  
High Entropy Alloy ◽  
Electrochemical Performances ◽  
Sacrificial Anode ◽  
X Ray Diffraction ◽  
Free Corrosion Potential ◽  
High Entropy ◽  
Prepared Alloy

A novel AlMgZnSnPbCuMnNi high entropy alloy was prepared by flux melting in the atmosphere. The microstructure and the electrochemical performances of the as-prepared alloy were studied by electrochemical workstation, X-ray diffraction and scanning electron microscopy. It was found that the free corrosion potential is as low as-1.33V in the 3.5%NaCl solution in spite of the content of Al, Mg and Zn element of the high entropy alloy is far below than that of the traditional zinc or aluminum sacrificial anode material while the free corrosion current density is 2.93×10-5 A/cm2 which is close to the typical aluminum sacrificial anode material.

Corrosion Resistance of Electrodeposited RE-Ni-W-P-SiC-PTFE Composite Coatings

2008 ◽  
Vol 41-42 ◽  
pp. 349-355
Author(s):  
Xiao Yun Zhu ◽  
Zhong Cheng Guo ◽  
Xian Wan Yang
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Sulfuric Acid ◽  
Hydrochloric Acid ◽  
Composite Coatings ◽  
Acid Solutions ◽  
Anode Polarization ◽  
Ptfe Composite ◽  
Corrosion Rates ◽  
Hydrochloric Acid Solutions

Corrosion rates and anode polarization curves of RE-Ni-W-P-SiC-PTFE composite coatings in various concentrations of sulfuric acid and hydrochloric acid solutions have been studied. Results show that corrosion law of the RE-Ni-W-P-PTFE-SiC composite coatings in various concentrations of sulfuric acid solutions is identical. The corrosion rates of the composite coatings are increased with increasing sulfuric acid concentration while the corrosion rates are decreased with increasing concentration of hydrochloric acid. Anode polarization curves of RE-Ni-W-P-SiC-PTFE composite coatings in various concentrations of sulfuric acid and hydrochloric acid solutions have showed that anode polarization electric current density of the composites at 200°C or 500°C heat treatment was below that at other heat treatment, it is clear that the composite coatings at 200°C or 500°C heat treatment has better corrosion resistance.

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