Galvanic corrosion can be defined simply as being the effect resulting from contact between two different metals or alloys in a conducting corrosive environment. Another term employed is galvanic coupling. When a metal is immersed in any electrolytic solution, it is possible to measure its dissolution natural corrosion. For each solution, it is possible to establish a "galvanic series", that is, a ranking of different metals and alloys as a function of this measured potential. When two different metals or alloys immersed in the same solution are joined together electrically, an electric current will be set up between them, resulting from the short circuit created.
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This guide covers the development of a galvanic series and its subsequent use as a method of predicting the effect that one metal can have upon another metal can when they are in electrical contact while immersed in an electrolyte.
Suggestions for avoiding known pitfalls are included. The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Galvanic Corrosion Testing
Historical Version s - view previous versions of standard. More G This type of accelerated corrosion is referred to as galvanic corrosion. Because galvanic corrosion can occur at a high rate, it is important that a means be available to alert the user of products or equipment that involve the use of dissimilar metal combinations in an electrolyte of the possible effects of galvanic corrosion. The metal that will suffer increased corrosion in a galvanic couple in that environment can then be predicted from the relative position of the two metals in the series. The potentials themselves versus an appropriate reference half-cell are listed so that the potential difference between metals in the series can be determined.
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