A Comparative Study of the Corrosion Behaviour of Steel in Neutral and Alkaline Media

1974 ◽  
pp. 353-367
Author(s):  
V. K. Gouda ◽  
S. M. Sayed
Keyword(s):  
Comparative Study ◽  
Corrosion Behaviour ◽  
Alkaline Media

scholarly journals The influence of gelatine on the corrosion behaviour of cold worked copper wire in alkaline media

2006 ◽  
Vol 42 (1) ◽  
pp. 33-43 ◽  
Author(s):  
Svetlana Ivanov ◽  
Mirjana Rajcic-Vujasinovic ◽  
Zoran Stevic
Keyword(s):  
Corrosion Rate ◽  
Corrosion Behaviour ◽  
Copper Wire ◽  
Positive Influence ◽  
Open Circuit ◽  
Alkaline Media ◽  
Forming Process ◽  
Deformation Degree ◽  
Cold Worked ◽  
Potentiodynamic Method

Copper wire obtained by dip-forming process was cold worked to the deformation degrees of 83, 87, 91, 95 and 99 %. Electrochemical potentiodynamic method was used to investigate corrosion behavior of these wires in aqueous solutions of Na2CO3 (1 mol/dm3). Open circuit potentials as well as peak potentials are given as a function of deformation degree in Na2CO3 without and with addition of gelatine in concentration between 0.1 and 0.5 g/l. It was found that the addition of gelatine does not change the mechanism of the process, but influences on current density. Small concentrations of gelatine (0.1 g/l or less) have positive influence on the corrosion protection of copper in alkaline solution, but the addition of gelatine in concentration 0.5 g/l causes the increasing of its corrosion rate.

Microstructural Characterization, Tribological and Corrosion Behaviour of Forged and Cast Grinding Balls a Comparative Study

2021 ◽  
Vol 406 ◽  
pp. 334-347
Author(s):  
Khedidja Bouhamla ◽  
Amel Gharbi ◽  
Oualid Ghelloudj ◽  
Ali Hadji ◽  
Maouche Hichem ◽  
...  
Keyword(s):  
Cast Iron ◽  
Comparative Study ◽  
Wear Behavior ◽  
Corrosion Behaviour ◽  
Wear Behaviour ◽  
High Chromium ◽  
Grinding Balls ◽  
Corrosion Tests ◽  
High Chromium Cast Iron ◽  
Chromium Cast Iron

Various facilities are used in mineral processing to prepare raw material. Practically, two types of balls are used, cast balls and forged balls. They are respectively made from high chromium cast iron and forged steel and are supplied in different sizes and chemical compositions. The cast and forged balls have different microstructures and consequently display dissimilar wear behavior. The target aimed in this work is to achieve a comparative study taking into account the type of microstructure, mechanical properties, and wear behavior of these two kinds of materials. Specimens have undergone chemical, metallographic and XRD characterizations. Subsequently, these samples were subjected to hardness measurements, abrasion and friction tests in order to evaluate their wear behaviour. Tribological tests, under unlubricated environment, are carried out on both types of grinding balls in order to study the wear system. Corrosion tests are also performed on forged steel and high chromium cast iron ball samples. The obtained results reveal a large difference in terms of chemical composition and microstructural components. Chromium cast iron balls are more resistant to friction, whereas forged balls are more resistant to abrasion. Additionally, the corrosion tests reveal a narrow discrepancy in corrosion behaviour between the studied materials.

A Comparative Study on Gold and Platinum Dissolution in Acidic and Alkaline Media

2014 ◽  
Vol 161 (12) ◽  
pp. H822-H830 ◽  
Author(s):  
Serhiy Cherevko ◽  
Aleksandar R. Zeradjanin ◽  
Gareth P. Keeley ◽  
Karl J. J. Mayrhofer
Keyword(s):  
Comparative Study ◽  
Alkaline Media ◽  
Platinum Dissolution ◽  
Acidic And Alkaline Media

scholarly journals Corrosion behaviour of copper - nickel alloys in LiBr solutions: A comparative study

2019 ◽  
Vol 0 (0) ◽  
pp. 0-0
Author(s):  
Shaimaa Abd Elhamid ◽  
abeer el meleigy ◽  
Adel ATTIA ◽  
ali El warraky ◽  
saad Abd-El-Wahab
Keyword(s):  
Comparative Study ◽  
Nickel Alloys ◽  
Corrosion Behaviour ◽  
Copper Nickel

scholarly journals Comparative study of equilibrium characteristics of Cu|Cu(II), Cu(I), glycine system containing sulfate or perchlorate as a supporting electrolyte

Chemija ◽  
2019 ◽  
Vol 30 (4) ◽  
Author(s):  
Kazimieras Mikulskis ◽  
Stasė Kanapeckaitė ◽  
Arvydas Survila
Keyword(s):  
Experimental Data ◽  
Comparative Study ◽  
Supporting Electrolyte ◽  
Molar Fraction ◽  
Alkaline Media ◽  
Acid Media ◽  
Solution Interface ◽  
Proton Donors ◽  
Thermodynamic Probability ◽  
Cu Ions

The distribution of species in Cu(II)-glycine solutions, containing sulfate or perchlorate as a supporting electrolyte, is considered. Substantial differences are observed at pH < 4.5, where the molar fraction of monoligand complex (associate) CuSO4 reaches up to 20 percent of the total Cu(II) concentration. Cu(I)-containing species are generated at the Cu|solution interface. These are Cu+ aqua-complexes (acid media) or mono- and bidentate Cu(I)-glycine complexes (alkaline media). The addition of sulfate reduces the content of Cu+ ions, but practically does not affect the distribution of Cu(I) complexes. The study of acidbase equilibria involving Cu+ ions shows that the thermodynamic probability of Cu2O formation remains low in both perchlorate and sulfate media. HSO4– ions formed in acid media should be treated as rather labile proton donors. This is quantitatively confirmed by experimental data, according to which the rate of hydrogen evolution increases correspondingly when perchlorate is replaced by sulfate in glycine solutions.

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