Corrosion behavior of T2 copper in 3.5% sodium chloride solution treated by rotating electromagnetic field

Copper is susceptible to producing corrosion problems in corrosive environments, which leads to serious safety problems. Thus, investigating the corrosion behavior of copper is of great significance. The effects of rotating electromagnetic field on corrosion behavior of T2 copper in 3.5% sodium chloride solution with electrochemical measurements were investigated. The results showed that rotating electromagnetic field changed properties of 3.5% sodium chloride solution by increasing the values of temperature and pH and decreasing the values of conductivity and dissolved oxygen. The rotating electromagnetic field improved the corrosion resistance of T2 copper. The corrosion products of T2 copper in treated 3.5% sodium chloride solution were composed of Cu20 and CuCl. The low corrosion rate of T2 copper was resulted from the decrease of dissolved oxygen in 3.5% sodium chloride solution treated by rotating electromagnetic field.

Crystal orientation and corrosion resistance of CuNi10Fe1Mn alloy billet under rotating electromagnetic field

CuNi10Fe1Mn alloy billet under rotating electromagnetic field (REF) was characterized in this work. The change of the crystal orientation was first explored by X-ray diffraction (XRD) and scanning election microscope (SEM); the corrosion resistance was done by three electrodes system, and the natural sea water was used as corrosion medium. The results demonstrate that the strongest crystal orientation is transformed from crystal plane (200) to (111); moreover, the crystal plane (111) whose intensity is the strongest on the cross section and vertical section with REF causes the tubes be rolled easily, and the corrosion resistance of the billet is increasing with REF. As a result, properties of CuNi10Fe1Mn alloy tubes can be improved by REF.

Flow Structure in RH Vacuum Degasser Using Rotating Electromagnetic Field

An innovative steelmaking process is suggested using an electromagnetic driven swirling flow in the up-leg of an RH vacuum degasser.A physical and a mathematical model based on 300t RH vacuum degasser are developed to understand the effect of rotating electromagnetic field on the circulation flow rate and the two phases flow behavior of RH system.Both water model experiments and numerical simulation show the flow pattern and distribution of gas bubbles. The gas bubbles move towards the centre of up-leg under the effect of rotating electromagnetic field,and the accumulation of gas bubbles depends on the magnetic intensity.An optimization value of magnetic intensity was suggested in this paper.

Effect of Rotating Electromagnetic Stirring on Solidification Structure of Incoloy 800H

In this work,the solidification structure of Incoloy 800H with rotating electromagnetic stirring(R-EMS)and without R-EMS were investigated.Comparing the structure without R-EMS,structure with R-EMS is greatly affected by the R-EMS.From the point of view of dendrites,we studied the evolution of solidification structure of Incoloy 800H with R-EMS,consisting of the fine equiaxed dendrites,the long unidirectional dendrites,cross dendrites and equiaxed dendrites.According to the evolution,dendrite fragment dissociation was presented and proved by acquiring the main element composition variation of dendrite trunk in the different zone.As a result,element segregation of the ingot is improved and the grains are refined.

Microstructural refinement and performance improvement of Cu-36 wt%Zn alloy by Al_(2)O_(3)nanoparticles coupling electromagnetic stirring

Cu-36 wt%Zn alloy is widely used in valves of water and heating and auto parts,etc.Nevertheless,the structure is still coarse,and performances are much poor.The structure and performances of Cu-36 wt%Zn alloy were investigated by adding Al_(2)O_(3)nanoparticles and stirring.Results indicate that by Al_(2)O_(3)nanoparticles coupling electromagnetic stirring,the Cu-36 wt%Zn alloy with refined microstructure was successfully prepared.The average grain size is refined by 99%compared with that without nanoparticles and stirring.The tensile strength(R_m)and percentage elongation after fracture(A11.3)increase by 20.58%and 19.40%,respectively,compared with that without nanoparticles and stirring.Nanoparticles increase heterogeneous nucleation rate by 50%compared with that without nanoparticles.The depth of dezincification layer decreases by 78.71%compared with that without nanoparticles and stirring,as protective layer(Cu-Al_(2)O_(3)-Zn)is completely formed around the grain boundaries.