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1. • CommentAuthorwarnold
   • CommentTimeSep 3rd 2007

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   We have what appears to be a steel part, with zinc plate and chromed (that golden colour you often see on metal parts). Growing on these parts looks like hairs. When we wipe them off they leave behind little pit marks, which are rust coloured. The thinking here is that it's a fungus growing on the metal, and it has eaten through the surface coating. Does anyone have any ideas what causes these hairs/whiskers? They are white in colour, and about 2-3mm long.
2. • CommentAuthorwarnold
   • CommentTimeSep 4th 2007

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   here is a picture of the corrosion

   
3. • CommentAuthorKevinG
   • CommentTimeSep 28th 2007

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   These whiskers are zinc and are related to stresses induced during the plating process.
4. • CommentAuthorwangxiangrong76
   • CommentTimeOct 26th 2007

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   Brown red corrosion products is the typical characteristic of filamentous corrosion which is a special form of crevice corrosion. Filamentous corrosion often be found on the steel, aluminum and magnesium that covered with zinc plate or chromed. Its greatest impact factor is the relative humidity. When the relative humidity is between 65%~90%, filamentous corrosion will occur.
   The ways of protection include avoiding using the coating between the above relative humidity, using a low permeable capacity coating and using crisp coating.