Our biodiesel process has seen a recent introduction of sulfuric acid. We would like to use the existing 316 SS piping for six to eight months with anodic or cathodic protection. The biodiesel runs at 120 Celsius and will have 0.2% to 3% sulfuric acid. Can we estimate the corrosion rate and/or protect?
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Re: Can we estimate the corrosion rate with cathodic/anodic protection systems?
5 October 2011 at 1:29pmI am afraid I can only make some general comments on your question given the lack of details and my lack of experience with cathodic/anodic protection systems. The corrosivity of your product containing the sulfuric acid will depend on what other constituents are present. The presence of chlorides or oxidizers at very low levels under acidic conditions can cause corrosion of austenitic stainless steels like 316, especially at the high temperature of your process. You will need to dive into the details and carefully research this further to answer your questions. If you decide on exploring cathodic or anodic protection systems, I encourage to consult an expert in their design. A poorly designed cathodic or anodic protection system can make corrosion worse.
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