Uniform corrosion hydrogen sulfide

Scale deposits create conditions for concentration-cell corrosion as they do not form uniformly over the metal surface. Sulfate-reducing bacteria thrive under these deposits, producing hydrogen sulfide and, consequently, increasing the rate of corrosion. Due to the following factors, the drilling fluid environment is ideal for scale deposition [189]. These factors are as follows ... 

With the exception of thiophenes, sulfur compounds react with metal surfaces at elevated temperatures, forming metal sulfide, certain organic molecules, and hydrogen sulfide. Corrosion is in the form of uniform thining, localized attack, or erosion corrosion. 

HjS in presence of water is known to cause sour corrosion. This name covers different mechanisms uniform corrosion, sulfide stress cracking (SSC) and hydrogen induced cracking (HIC). 

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