Prevent Calcareous Layer Subsea Prevent Calcareous Layer Subsea SiggiN (Marine/Ocean) (OP) 5 Sep 22 10:56 Hi! Are there any metals/alloys that are inherently resistant to the formation of calcareous layer for metals subsea connected to cathodic protection system? Regards Siggi RE: Prevent Calcareous Layer Subsea TugboatEng (Marine/Ocean) 6 Sep 22 16:50 I can't find any free information. It looks like magnesium inhibits the formation of calcareous deposits. https://meridian.allenpress.com/corrosion/article-... If this is a heat exchanger application consider operating the exchanger at a higher temperature to prevent deposits. We see distinction zones of deposits based on temperature distribution of our exchangers. 120°F and lower forms deposits, higher stays clean. I always assumed this was bio fouling related but perhaps they are calcareous deposits. Electrically isolating the exchangers also reduces deposit formation (less cathodic).