Forms of Corrosion
本帖最后由 hiatc 于 2009-11-10 14:54 编辑
The forms of corrosion described here use the terminology in use at NASA-KSC. There are other equally valid methods of classifying corrosion, and no universally-accepted terminology is in use. Keep in mind that a given situation may lead to several forms of corrosion on the same piece of material.
Uniform Corrosion
This is also called general corrosion. The surface effect produced by most direct chemical attacks (e.g., as by an acid) is a uniform etching of the metal.
Galvanic Corrosion
Galvanic corrosion is an electrochemical action of two dissimilar metals in the presence of an electrolyte and an electron conductive path. It occurs when dissimilar metals are in contact.
Concentration Cell Corrosion
Concentration cell corrosion occurs when two or more areas of a metal surface are in contact with different concentrations of the same solution.
Pitting Corrosion
Pitting corrosion is localized corrosion that occurs at microscopic defects on a metal surface. The pits are often found underneath surface deposits caused by corrosion product accumulation.
From http://corrosion.ksc.nasa.gov/corr_forms.htm
The forms of corrosion described here use the terminology in use at NASA-KSC. There are other equally valid methods of classifying corrosion, and no universally-accepted terminology is in use. Keep in mind that a given situation may lead to several forms of corrosion on the same piece of material.
Uniform Corrosion
This is also called general corrosion. The surface effect produced by most direct chemical attacks (e.g., as by an acid) is a uniform etching of the metal.
Galvanic Corrosion
Galvanic corrosion is an electrochemical action of two dissimilar metals in the presence of an electrolyte and an electron conductive path. It occurs when dissimilar metals are in contact.
Concentration Cell Corrosion
Concentration cell corrosion occurs when two or more areas of a metal surface are in contact with different concentrations of the same solution.
Pitting Corrosion
Pitting corrosion is localized corrosion that occurs at microscopic defects on a metal surface. The pits are often found underneath surface deposits caused by corrosion product accumulation.
From http://corrosion.ksc.nasa.gov/corr_forms.htm
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