Corrosion in dermacoat coated caron steel
Corrosion in dermacoat coated caron steel
(OP)
Dear All
I am facing some issues related to the corrosion of dermacoat coated carbon steels bolts with grade astm a490m. These bolts are installed in an ammonia plant with 1 year in service. At the same time i have some bolts which are coated with hot dip galvanized coating the grade of the bolts is astm a325m but they are not corroded. Only dermacoated bolts got corroded. Corrosion seams to be like rust with only those surfaces corroded which are exposed to the environment. Any idea why this is happening.
I am facing some issues related to the corrosion of dermacoat coated carbon steels bolts with grade astm a490m. These bolts are installed in an ammonia plant with 1 year in service. At the same time i have some bolts which are coated with hot dip galvanized coating the grade of the bolts is astm a325m but they are not corroded. Only dermacoated bolts got corroded. Corrosion seams to be like rust with only those surfaces corroded which are exposed to the environment. Any idea why this is happening.





RE: Corrosion in dermacoat coated caron steel
RE: Corrosion in dermacoat coated caron steel
RE: Corrosion in dermacoat coated caron steel
Perhaps a link to the product datasheet...
RE: Corrosion in dermacoat coated caron steel
Maui
RE: Corrosion in dermacoat coated caron steel
RE: Corrosion in dermacoat coated caron steel
RE: Corrosion in dermacoat coated caron steel
Dacromet contains Chromium 3 (Cr3+)
Ammonia reacts with chromium(III) ion to precipitate gray-green chromium(III) hydroxide:
Cr3+(aq) + 3NH3(aq) + 3H2O(l) <==> Cr(OH)3(s) + 3NH4+(aq)