Research on Removal of Sulfide Inclusion in Steel Surface by Molten Salt Electrolysis

Steel including sulfide inclusion was used as cathode, while high density graphite rod was used as anode. Sulfide inclusion in steel surface was removed by molten salt electrolysis in molten CaCl2 at 850 under the stationary voltage. The influences of the voltage and electrolytic time on the process of reaction were investigated. The distributions of the sulfide inclusion were investigated by SEM. The desulfurated ratio was investigated by quantitative metallographic analysis, Cyclic voltammetry was performed to characterize reactions of cathode. The results show that the voltage and the time of electrolysis were in direct proportion with desulfurated ratio. The higher voltage and the longer electrolysis time is, the greater the desulfurated ratio is.

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Preparation of Al-Sc Alloy by LiF-ScF3-ScCl3 Molten Salt Electrolysis

Materials Science Forum ◽

10.4028/www.scientific.net/msf.675-677.1125 ◽

2011 ◽

Vol 675-677 ◽

pp. 1125-1128 ◽

Cited By ~ 1

Author(s):

Rui Guo ◽

Xiu Jing Zhai ◽

Ting An Zhang

Keyword(s):

Molten Salt ◽

Base Alloy ◽

Process Condition ◽

Cell Voltage ◽

Scandium Oxide ◽

Raw Material ◽

Electrolysis Time ◽

Molten Salt Electrolysis ◽

Aluminum Base Alloy ◽

Aluminum Base

The paper studied the preparation of Al-Sc alloy by molten salt electrolysis. LiF-ScF3-ScCl3 as the electrolyte, Sc2O3 as raw material, liquid Al as cathode and graphite as anode. The process condition of preparating Al-Sc alloy includes the influence of current density, electrolysis time, temperature of electrolysis, Back EMF, content of Sc in alloy and current efficiency.The content of Sc in alloy prepared by this method has reached to the maximum of 3.437%. The components of alloys showed by SEM were uniform, it is applicable for commercial purposes. Preparation of Al-Sc alloys with scandium oxide as raw materials, it not only reduce environment pollution, but also decease the cost of production. It is reported in many documents, preparing aluminum base alloy by the method of molten salt electrolysis[1-3], people could make many alloys such as Al-Ce、Al-La、Al-RE、Al-Ti、Al-Si-Ti in the aluminum cell, also the method to prepare some rare earth alloys such as Al-Sr、Nd-Fe、La-Ni was reported[4,5]. Use the method of electrolysis to produce some aluminum base alloy with high-melting-point , difficult to restore , high-priced element is a good method because it is technological process is brief, economy is rational, the technology is feasible, this viewpoint is broadly approved in the world[6]. It isn’t necessary to use high-priced Sc as raw material in preparing Al-Sc alloy with molten salt electrolysis, it could control the Sc amounts in the alloy through the different current efficiency and electrolysis time, production in this method could be continuous or semi-continuous, so it is easy to be automatic controlled. A new molten salt system is used in this paper, we use molten salt electrolysis to produce Al-Sc alloy, take scandium oxide as raw material, through the study of the effect of the current intensity，electrolysis time and the electrolysis temperature , Back EMF and cell voltage, the final production Al-Sc alloy contains Sc 2~6%.

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Study on Cyclic Voltammetry in Na3AlF6-Al2O3-LiF Molten Salt Electrolysis

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.746.101 ◽

2013 ◽

Vol 746 ◽

pp. 101-105

Author(s):

Shao Hu Tao ◽

Yue Zhong Di ◽

Jian Ping Peng ◽

Kun Zhao ◽

Nai Xiang Feng

Keyword(s):

Cyclic Voltammetry ◽

Molten Salt ◽

Xrd Analysis ◽

Electrochemical Process ◽

Single Step ◽

Molar Ratio ◽

Al Alloy ◽

Tungsten Electrode ◽

Molten Salt Electrolysis ◽

Cr System

Electrochemistry reaction of the Al3+ by means of cyclic voltammetry. The results show that the Al3+ was reduced to Al metal in a single step. During the electrochemical process, metal Na and Li did not deposit out on tungsten electrode. After adding LiF, the oxidation peak of Al was weakened and the oxidation quality of Al decreased. Compared with cyclic voltammetry curves at different CR ratio (CR=molar ratio of NNaF/NAlF3 in the bath), LiF is more effective in the low CR system for electrolyte. The XRD analysis shows that Li-Al alloy was soluble in the molten salt while Li + and Al3+occured alloying reaction.

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