The electrolytic cleaning process was studied in view of simulation. It is supposed that remaining dirt on surface of strip is evenly distributed before electrolytic cleaning with thickness of d, a bubble (radius of r) generated from strip can remove dirt with the volume of 4πr2d, and in the process of a bubble generated the thickness of the dirt (d) keeps invariant. Under the premise of simplified conditions, taking Faraday’s Law as a starting point main model had been built. And so expressions of the relations between process parameters and decontamination ratio were obtained. The results of experiment accord with those of simulation. Based on the model, using mixed program of Matlab and Visual C++, the simulation program software was developed. The results show that the way to simulate original electrolytic cleaning process of cold rolled strip is feasible.
Ti-doped diamond-like carbon(Ti-DLC) coatings and undoped diamond-like carbon(DLC) coatings were synthesized by unbalanced magnetron sputtering using carburized Chromium Molybdenum Steels (SCM415) as substrates. Nanocomposite structure coatings with metal carbides nanocrystals uniformly dispersing in the amorphous carbon matrix were obtained by the optimization of the kinds of doped metals and deposited parameters. This kind of nanocomposite structure permits improved hardness while maintaining a lower residual stress and getting thick coatings. The friction coefficients of Ti doping DLC coatings are relatively lower compared with undoping DLC coatings in engine oil. The analysis on the wear surface of coatings have indicated that: the surface of DLC doped with metal absorbs more elements from the engine oil, which indicates that the doping of metal can improve the affinity of the coating for the engine oil, enhance the formation of lubrication oil films, and reduce the friction coefficient thereby.
Two models with and without insulating clapboard were established. The electric potential distribution and the flow of electric current in electrolytic cell under the two models were simulated by Ansoft finite element software. The results show that the distribution of equipotential surface is the most intensive in the area close to the electric plate,and the current in the cell obviously skewed flows to the bottom of the strip under the insulating clapboard model , which is important to improve the current efficiency of the electrolytic cleaning. Finally, the influence of insulating clapboard on current efficiency and under different plate spacing were carried on by experiment and analysis, proved the correctness of the simulation results.
The electrochemical behaviors of the cold-rolled steel strip were investigated at the range of ordinary current density (10A/dm2-30A/dm2). The power consumption, which is caused by overpotential of the cold-rolled steel strip per unit area (PCOC), was used to evaluate the energy consumption which is caused by polarization effectively. The effects of electrolysis time, current density, temperature and the concentration of electrolyte on the PCOC were examined. The PCOC increased with time, but the growth rate of the PCOC decreased with time. After about 8 seconds, the increasing rate of the PCOC closed to zero. The value of the PCOC was in direct proportion to current density, and there was a significant increase when the current density is beyond 25A/dm2. Both raising temperature and increasing the concentration of electrolyte are effective ways of decreasing the PCOC.
The model of electrolytic cleaning for cold rolled strip was established, and the simulation of cleaning process was carried out in the finite element method with the software (Ansoft). The influence of processing parameters was investigated. The results show that, the processing parameters, such as the current efficiency, the electrode plate intervals and the insulation board have intense influence on current efficiency, which is significant for improving cleaning efficiency and energy conservation.
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