Effect of Temperature on Electrochemical Behavior of Stainless Steel in Phosphoric Acid

2013 ◽  
Vol 351-352 ◽  
pp. 1072-1076 ◽  
Author(s):  
Wen Shi ◽  
Song Xiang ◽  
Yan Li Li ◽  
Ming Yang ◽  
Ya Nan Hu ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Phosphoric Acid ◽  
Acid Solution ◽  
Electrochemical Behavior ◽  
Electrochemical Impedance ◽  
Corrosion Current ◽  
Phosphoric Acid Solution ◽  
Effect Of Temperature ◽  
Solution Temperature ◽  
304L Stainless Steel

Electrochemical behavior of 304L and S32304 stainless steel in different temperature and concentration phosphoric acid solution by means of polarization curve and electrochemical impedance spectroscopy. The results showed that with the increase of the phosphoric acid solution temperature, the corrosion voltage and the corrosion current of the stainless steel increase and the polarization resistance and solution resistance decrease. The corrosion-resistant properties of S32304 stainless steel are superior to that of 304L stainless steel.

The Effect of Temperature on the Leaching of Malachite in Phosphoric Acid Solution

2014 ◽  
Vol 962-965 ◽  
pp. 818-821 ◽  
Author(s):  
Cui Cui Ji ◽  
Dan Dan Wu ◽  
Shu Ming Wen ◽  
Jiu Shuai Deng
Keyword(s):  
Phosphoric Acid ◽  
Acid Solution ◽  
Phosphoric Acid Solution ◽  
Effect Of Temperature ◽  
Solution Temperature ◽  
Shrinking Core Model ◽  
Surface Chemical ◽  
Leaching Rate ◽  
Surface Chemical Reaction ◽  
Shrinking Core

In this study, the effect of leaching of malachite was investigated using phosphoric acid solution as leaching agent. The effect of temperature on the leaching of malachite was investigated. The leaching rate increased with increasing solution temperature, and a kinetic model was developed to represent this relationship. The leaching was controlled by the shrinking core model for surface chemical reaction. The activation energy of the leaching process was determined to be 30.65kJ/mol.

scholarly journals Corrosion Behaviour of a Highly Alloyed Austenitic Alloy UB6 in Contaminated Phosphoric Acid

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
M. Boudalia ◽  
A. Guenbour ◽  
A. Bellaouchou ◽  
R. M. Fernandez-Domene ◽  
J. Garcia-Anton
Keyword(s):  
Stainless Steel ◽  
Phosphoric Acid ◽  
Electrochemical Impedance ◽  
Corrosion Behaviour ◽  
Electrochemical Behaviour ◽  
Phosphoric Acid Solution ◽  
Flat Band ◽  
Potential Range ◽  
Potentiodynamic Curves ◽  
P Type

The influence of temperature (20–80°C) on the electrochemical behaviour of passive films anodically formed on UB6 stainless steel in phosphoric acid solution (5.5 M H3PO4) has been examined by using potentiodynamic curves, electrochemical impedance spectroscopy, and Mott-Schottky analysis. UB6 stainless steel in contaminated phosphoric acid is characterised by high interfacial impedance, thereby, illustrating its high corrosion resistance. The obtained results show that the films behave as n-type and p-type semiconductors in the potential range above and below the flat band potential, respectively. This behaviour is assumed to be the consequence of the semiconducting properties of the iron oxide and chromium oxide regions which compose the passive film.

Electrochemical Behavior of 430 Ferritic Stainless Steel in HCl Solution at Different Temperatures

2013 ◽  
Vol 446-447 ◽  
pp. 394-397
Author(s):  
Pei Yang Shi ◽  
Xiao Liang Li ◽  
Ying Ying Yue ◽  
Cheng Jun Liu ◽  
Mao Fa Jiang
Keyword(s):  
Stainless Steel ◽  
Hydrochloric Acid ◽  
Acid Solution ◽  
Hydrochloric Acid Solution ◽  
Electrochemical Behavior ◽  
Effect Of Temperature ◽  
Positive Direction ◽  
Tafel Slope ◽  
Different Temperatures ◽  
Pickling Process

The environmental concerns brought during pickling process of stainless steel in HNO3-containing acids need urgent attention. Choosing the hydrochloric acid pickling process as study object, this paper conducted a systematic study of the effect of temperature on the electrochemical behavior of stainless steel in hydrochloric acid solution. Research indicated that as temperature rose, the corrosion potential of 430SS in hydrochloric acid solution moved to positive direction with band to a narrow 0.1V. Meanwhile, the current intensity increased which indicated the acceleration of corrosion rate. In addition, the anode Tafel slope increased firstly and decreased later while the cathode Tafel slope increased slightly.

The Corrosion Behavior of 304L and 316L Stainless Steel in Food Grade Phosphoric Acid Solutions

2011 ◽  
Vol 109 ◽  
pp. 28-31 ◽  
Author(s):  
Yan Li Li ◽  
Song Xiang ◽  
Hong Tao Zeng ◽  
Jiang Ping Wang ◽  
Quan Ding Wang
Keyword(s):  
Stainless Steel ◽  
Phosphoric Acid ◽  
Corrosion Behavior ◽  
316L Stainless Steel ◽  
Corrosion Potential ◽  
Phosphoric Acid Solution ◽  
304L Stainless Steel ◽  
Food Grade ◽  
Passive Behavior ◽  
Weight Loss Method

The corrosion behavior of 304L and 316L stainless steel have been investigated in 55 °C,85% food grade phosphoric acid solution by weight loss method and dynamic potential scan , the surface morphology was observed by scanning electron microscopy(SEM). The results showed that the number of pits in 304L was much more than that in 316L. The contents of Cr inside pits were greater than that in the smooth surface in the two stainless steels, indicating the Cr-poor are prone to corrosion. All the samples exhibited stable passive behavior which can be seen from the potentiodynamic polarization curves, 316L corrosion potential (-0.201V) was higher than that of 304L the corrosion potential (-0.357V), and under the same circumstance, 316L stainless steel was more corrosion-resistant than 304L stainless steel.

scholarly journals Effect of Mechanical Surface Treatments on the Surface State and Passive Behavior of 304L Stainless Steel

Metals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 135
Author(s):  
Kathleen Jaffré ◽  
Benoît Ter-Ovanessian ◽  
Hiroshi Abe ◽  
Nicolas Mary ◽  
Bernard Normand ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Stainless Steel ◽  
Surface State ◽  
Electrochemical Impedance ◽  
Passive Films ◽  
Surface Finishing ◽  
Ultrafine Grain ◽  
304L Stainless Steel ◽  
Passive Behavior

The effect of dry grinding on 304L stainless steel’s passive behavior is compared to two other surface finishing (mechanical polishing down to 2400 with SiC emery paper and 1 µm with diamond paste, respectively). The characterization of the surface state was performed using scanning electron microscopy, transmission electron microscopy, 3D optical profilometer, and X-ray diffraction. Results indicate that each surface treatment leads to different surface states. The ground specimens present an ultrafine grain layer and a strong plastic deformation underneath the surface, while an ultrafine grain layer characterizes the subsurface of the polished specimens. Grinding induces high residual compressive stresses and high roughness compared to polishing. The characterization of the passive films was performed by electrochemical impedance spectroscopy and Mott–Schottky analysis. The study shows that the semiconductor properties and the thickness of the passive films are dependent on the surface state of the 304L stainless steel.

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