Prepared By Mechanical Alloying Magnesium-based Super-corrosion Alloy And Its Corrosion Behavior In Nacl Solution

Energy source is an essential demand of developing national economics, also is a crucial fact to improve people's standard of living. As putting force to new energy sources, such as solar energy, wind energy, biology energy, hydrogen energy, terrestrial heat, nuclear energy and so on, we should pay more attention to other ways to collect heat sources.Because of the asymmetry of the electrochemical characteristics, Fe-Mg alloys synthesized by mechanical alloying (MA) show a behavior of galvanic corrosion, which results in the heat and H2 release. The released heat can be used by climbers, divers; also can calorify the mechanical and canned food in jumping-offs or cold districts. Meanwhile, the released H2 can make up the flotage loss of submarines and can be used for combustion battery of dynamic systems.In this paper, the galvanic corrosion behavior of Fe-Mg alloys synthesized by MA in various salt solutions was investigated. It was found that different milling conditions (including atomic proportion of Fe to Mg, milling machines), and different electrolyte conditions (including electrolyte variety, electrolyte concentration, initial temperature) all have effects on the final corrosion results of milled alloys.By means of an optical microscope, SEM, EDX, XRD and self-prepared equipments, we investigate the microstructures, compositions, and electrochemical behaviors of milled Fe-Mg alloys thoroughly. It was found that within 5%-20% atomic proportion of Fe, the alloys milled for at most 60 min can still keep the single state and no other phase appeared in XRD analysis, also Fe particles dispersed in Mg base as a form of zonal texture. Under the planet milling condition, 10%Fe-Mg alloys milled for 40 min can release 870 ml H2, meanwhile, enable the temperature of 100 ml, 0.6M NaCl solution to increase 20.4C , which is the most ideal system in our research fields. Concussive milling can promote the corrosion microstructure formation; thus, increase the released volume of H2. Furthermore, 5%Cu-Mg and 5%C-Mg alloys are prepared for comparing with Fe-Mg alloys, of which the difference have been stated in the paper.The electrolyte is another important factor to the results. As concluded from the results, it is found that the initial temperature of NaCl solution has effect onthe reaction speed of galvanic corrosion, and thus on the finally released heat and H2. Compared with NaaSO4 and KC1, NaCl is the most rational choose of an electrolyte, especially when its concentration is higher than 0.2M. Pressing is not suitable, while portable to collect heat and H2 gas. In conclude, how to make the alloys more matter-of-fact is the crucial way to make it. realistically used.