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pitting |
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pitting [′pid·iŋ]
(medicine) The formation of pits; in the fingernails, a consequence and sign of psoriasis. The preservation for a short time of indentations on the skin made by pressing with the finger; seen in pitting edema. (metallurgy) Selective localized formation of rounded cavities in a metal surface due to corrosion or to nonuniform electroplating. (mining engineering) The act of digging or sinking a pit. popping, blowing, pitting, pops Shallow conical depressions, ranging in size from pinheads to diameters of ¼ in. (64 mm), just below the surface of a lime-putty finish coat; caused by the expansion of coarse particles of unhydrated lime or of foreign substances. pitting 1. The development of small cavities in a surface, owing to phenomena such as corrosion, cavitation, or (as in concrete) localized dis-integration. 2. In plastering, See popping. 3. The development of localized surface defects on a metal surface, e.g., small depressions, usually caused by electrochemical corrosion. 4. The localized corrosion in the form of cavities which takes place on the surface of a metal. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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No references found | Table 2: Pitting corrosion of untreated and treated AZ91D specimen exposed to 5 wt% NaCl solution Specimen Untreated Treated specimen specimen Corrosion test Immersion Immersion Time to the first observed pitting 2 h 36-72 h The above difference in the corrosion resistance between the molten salt treated and untreated AZ91D can be further confirmed by potentiodynamic tests. The primary mode of failure leading to water leaks is pitting corrosion of copper tubes, which, if it occurs, has a mean time to failure of about two years (Singh et al. There has also been a suggestion with zinc silicate in these hot, wet conditions that there can be a reversal in polarity so that the steel protects the zinc and pitting corrosion occurs. |
Pitting corrosion |
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