No corrosion rate but pitting rate is high

[nomankahn76]

Good Day All
I ran a software for Hydrogen sulhpide dominant case in which the output displays that corrosion rate is zero but high pitting rate what exactly it means?? how come corrosion rate mm/yr is zero but high pitting rate??? how would I explain it considering the electrochem reactions etc.
Thanks
Kahn

 

[SJones]

The software in question should have explanatory text to help you. The corrosion engineering forum has also suggested that pitting would be the expected morphology of the corrosion. The corrosion rate predicted by the model is that of uniform, general metal loss. It would appear that a literature survey would assist your understanding, so here are a few references to start you off:

NACE Corrosion 2010, Paper 10332

NACE Corrosion 2007, Paper 07659

NACE Corrosion 2006, Paper 06122

Steve Jones
Materials & Corrosion Engineer

http://www.linkedin.com/pub/8/83b/b04