Galvanic corrosion

voltaic corroding (also called dissimilar admixture corrosion or wrong electrolysis) refers to corrosion damage induced when two dissimilar matter ls are tallyd with a corrosive electrolyte. Galvanic corrosion is an electrochemical execute In which one metal corrodes onto another when both metals are in electrical co intact, in the presence Of an electrolyte. When a galvanic couple forms, one Of the metals I n the couple becomes the anode and corrodes faster than it would all by itself, while e the other becomes the cathode and corrodes slower than it would by itself.So basically the anode metal is breaking down onto the cathode metal. For galvanic corrosion to occur, three things must be present Electrochemically dissimilar metals must be pre .NET, these metals must be in electrical contact, and the metals must be exposed to an electrolyte. Galvanic Corrosion was find in the late divulge of the eighteenth century b Lugging Galvanic in a series of experiments with the expos ed muscles and nerves of a frog that contracted when connected to a conductor.Its humorous to think Galvan ICC corrosion was plant on accident when experimenting on frogs. The concept was also e engineered into the effectual protection of metallic structures by Sir Humphrey Davys and Mice hall Faraday in the early part of the nineteenth century. The sacrificial corrosion of en metal much(prenominal) as zinc, magnesium or aluminum is a widespread method of protect metallic Structures. While galvanic corrosion is potentially problematic to cultured engineer s, they can use it to their benefit.For example buried or settle structures, in HTH s case, sacrificial anodes work as part of a galvanic couple, promoting corrosion of the e anode, in order to protect the cathode metal. To reticent it down one metals life is been g drastically reduce so the other metals life will last longer. On another notational system if you do not want galvanic corrosion taking turn up corrosion inhib itors such as sodium nitrite or sodium mouldboard can be injected into the systems to reduce the galvanic potential.However, the application Of these co wearing away inhibitors must be monitored closely. If the application of corrosion inhibitors increases the conductivity of the water in spite of appearance the system, the galvanic corrosion potent al can be greatly increased. A different means of avoiding galvanic corrosion is to coins deer the 2 electrical potential of the metals you are selecting. A galvanic series appoint the el citric potentials of metals, the relative position of two metals on such a series gives good indication of which metal is more in all probability to corrode more quickly.Looking back at my opening statement, you can at one time understand why galvanic corrosion can be so hostile. If you select the wrong metals in a system, and the e load electric charge metal of the system corrodes, you systems is bound to fail. On the to her end of the spectrum, galvanic corrosion can possibly be helpful, if indeed you want t o sacrifice one metal in order to protect another. With an indented friendship of galvanic corrosion civil engineers can predict and act upon potentially hazardous situations. 3