Magnesium is highly corrosive, hence not acceptable in many application. To approve the its use, it highly necessary to enhances it corrosion. But till now many coating procedure could not successful. What major drawback these coating have?
Steel can be protected against corrosion with coatings of zinc or aluminum, because in the galvanic pairs Fe-Zn, Fe-Al iron is a cathode (zinc and aluminum are more electrochemically active than iron and protect steel surfaces as sacrificial anodes). In contrast, magnesium is so active that there are no sacrificial anodes for it! For example, in combination with layers of zinc or aluminum, magnesium becomes an anode and, therefore, will corrode under these layers. To protect magnesiun against corrosion, there is currently only one option - polymeric coatings.
Hello,
Corrosion of magnesium and magnesium alloys is quite active. To reduce and use coatings to reduce contact with the active medium. Such coatings are TiN CrN and others obtained by vacuum electro-sputtering or magnetron sputtering.
@emil hristove. thank you for the answer.Please let me know the major mechanism which the cause that Mg can not compete with Al and others int terms of corrosion. Also Are you sure that TiN and CrN are the final reported ever best coatings. If we coat Mg in nano range what what material you think will best to be used for caotings? ZrO2, Al2O3, MgO, TiN, Mg2SiO4 or any other ....Can you help in this regards? Thank you very much.
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