Magnesium component

G lv nic Corrosion. Galvanic corrosion is an electrochemical process with four fundamental requirements (/) an anode (magnesium), 2) a cathode (steel, brass, or graphite component), (J) direct anode to cathode electrical contact, and (4) an electrolyte bridge at the anode and cathode interface, eg, salt water bridging the adjacent surfaces of steel and magnesium components. If any one of these is lacking, the process does not occur (133,134). 

The following checklist is given as a general guide to minimise the corrosion of magnesium components in service ... 

Bakery racks -magnesium components for [MAGNESIUM AND MAGNESIUM ALLOYS] (Vol 15)... 

A similar reaction holds for the magnesium component of carbonate rocks. The balance now is ... 

Firecrackers contain flash powder (a mixture of an oxidizer such as potassium chlorate or perchlorate and powdered aluminum or magnesium) or black gunpowder in a paper tube. An attached fuse ignites the flammable mixture, which bums explosively, producing gases that rapidly build up pressure and burst the container. Aluminum and magnesium components produce brighter flashes. 

Both of these factors lead to a lower melting point for the magnesium component by the relationship given previously... 

Organoalkali metal compound Magnesium component" Product Ref. 

The magnesium component of the dolomite raises the concentration of MgO in solution in the slag to 6 to 8 %, and helps to protect the magnesite refractory lining of the furnace by reducing the rate of solution of magnesium oxide. 

An electrolyte bridge at the anode and cathode interface (e.g., salt water bridging the adjacent surfaces of steel and magnesium components). 

Electrically isolate the magnesium component fi om the cathodic material. In many applications, however, this is not a practical alternative due to the mechanical, electrical, or cost requirements. 

Tawil, D. S. (1990), Protection of magnesium components in military applications. Paper no. 90445 in National Association of Corrosion Engineers 90 Conference, Las Vegas, 1990. 

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