Editing Magnesium (section)

====Corrosion====
In magnesium alloys, the presence of [[iron]], [[nickel]], [[copper]], or [[cobalt]] strongly activates [[corrosion]]. In more than trace amounts, these metals precipitate as [[intermetallic compound]]s, and the precipitate locales function as active [[cathode|cathodic]] sites that reduce water, causing the loss of magnesium.<ref name="giz" /> Controlling the quantity of these metals improves corrosion resistance. Sufficient [[manganese]] overcomes the corrosive effects of iron. This requires precise control over composition, increasing costs.<ref name="giz" /> Adding a cathodic poison captures atomic hydrogen within the structure of a metal. This prevents the formation of free hydrogen gas, an essential factor of corrosive chemical processes. The addition of about one in three hundred parts [[arsenic]] reduces the corrosion rate of magnesium in a salt solution by a factor of nearly ten.<ref name="giz">{{cite web|url=http://www.gizmag.com/stainless-magnesium-corrosion-monash/28856 |title=Stainless magnesium breakthrough bodes well for manufacturing industries |publisher=Gizmag.com |date=29 August 2013|author=Dodson, Brian |access-date=29 August 2013}}</ref><ref>{{Cite journal | last1 = Birbilis | first1 = N. | last2 = Williams | first2 = G. | last3 = Gusieva | first3 = K. | last4 = Samaniego | first4 = A. | last5 = Gibson | first5 = M. A. | last6 = McMurray | first6 = H. N. | doi = 10.1016/j.elecom.2013.07.021 | title = Poisoning the corrosion of magnesium | journal = Electrochemistry Communications | volume = 34 | pages = 295–298 | year = 2013 }}</ref>