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.

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

The Corrosion Behavior of Niobium in Hydrochloric Acid Solutions

CORROSION ◽  
1980 ◽  
Vol 36 (10) ◽  
pp. 554-558 ◽  
Author(s):  
B. S. COVINO ◽  
J. P. CARTER ◽  
S. D. CRAMER
Keyword(s):  
Hydrochloric Acid ◽  
Corrosion Rate ◽  
Corrosion Behavior ◽  
Mineral Resources ◽  
The United States ◽  
General Corrosion ◽  
Ferric Ion ◽  
Acid Solutions ◽  
Corrosion Rates ◽  
Hydrochloric Acid Solutions

Abstract Studies to better understand the corrosion behavior of niobium in hydrochloric acid solutions have been conducted as part of the Bureau of Mines’ effort to conserve the United States’ mineral resources. A study of the general corrosion behavior of niobium as a function of acid concentration, time, oxygen, and added ferric ion is reported. Weight loss (corrosion) tests were performed in air saturated (agitated and static) and helium saturated (agitated) hydrochloric acid solutions ranging from 1N to 10N at temperatures from 35 to 100 C and exposures up to 60 days. The 30 day corrosion rates ranged from 0.0 μm/y in 35 C air saturated (agitated) 1N HCl to 230 μm/y in air saturated (static) 9.8N HCl at 85 C. Although the corrosion rates decreased rapidly for times up to 30 days, the rates for 30 and 60 days were essentially identical. The presence of air did not affect the corrosion rate of niobium, while the presence of only 70 ppm of ferric ion reduced the corrosion rate in most air saturated 5N and 10N HCl solutions.

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.

Corrosion resistance of VT1-0 titanium in hydrochloric acid solutions

1988 ◽  
Vol 24 (2) ◽  
pp. 201-202
Author(s):  
V. E. Blashchuk ◽  
L. M. Onoprienko ◽  
M. V. Chervonyi
Keyword(s):  
Corrosion Resistance ◽  
Hydrochloric Acid ◽  
Acid Solutions ◽  
Hydrochloric Acid Solutions

Corrosion and Mass Transfer With Chemical Reaction–The Dissolution of Magnesium in Hydrochloric Acid

CORROSION ◽  
1968 ◽  
Vol 24 (8) ◽  
pp. 255-259 ◽  
Author(s):  
JOHN MARANGOZIS
Keyword(s):  
Mass Transfer ◽  
Hydrochloric Acid ◽  
Chemical Reaction ◽  
Uniform Corrosion ◽  
Acid Solutions ◽  
Corrosion Rates ◽  
Considerable Success ◽  
Rate Of Dissolution ◽  
Hydrochloric Acid Solutions ◽  
Transport Of Ions

Abstract The purpose of this paper is to review the theory of mass transfer, with and without chemical reaction, and to show how it can be applied in the prediction of uniform corrosion rates. As an example, experimental data reported for the rate of dissolution of magnesium cylinders in hydrochloric acid solutions were analyzed. A mechanism for the reactions and the transport of ions to or from the metal surface was suggested, and the model was used in the prediction of data with considerable success. Application of this method in other corrosion systems is presently under investigation, in an effort to broaden its usefulness and to determine its limitations.

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