Savcor Anodic and Cathodic Protection can minimize the corrosion in aggressive process environment without super-alloys. Savcor has proven protection systems for wide range of equipment for the process and energy industries. Our standard procedure is always to ensure the feasibility of the selected protection system with in-situ electrochemical measurements.
In the process industry, all sorts of chemicals are stored e.g. in stainless steel tanks and vessels. Every now and then the process conditions change to more aggressive and the tank begins to corrode. Process temperatures can increase or the concentration of aggressive ions such as chlorides are getting higher when the water circulation becomes more closed. Instead of replacing a corroding tank with a more noble and expensive material or lining it with some corrosion resistant coating the most cost effective solution is to install a CP or AP System. Usually the installation is very fast and the down-time is much less than in any coating application or overlay welding.
Cathodic Protection is commonly used in cooling water facilities such as concrete intake and outlet tunnels and pipes, bar screens, traveling screens and sluice gates. Even pump housings can benefit from cathodic protection. In large concrete structures, relatively small amount of anodes is sufficient to prevent the corrosion of reinforcement steel inside the concrete.
Cathodic protection can be applied to any steel structure in contact with soil; underground tanks, steel pipelines and tank bottoms.
Soil has always some amount of moisture and depending on the soil type, it can be very corrosive. Typically underground pipelines rely on coatings and CP together for the most ecomical corrosion control.
In sulphuric acid tanks, Anodic Protection passivates the steel by forming a protective ferrous sulfate layer on the mild steel surface. This layer is relatively soft and cannot withstand high flow rates. Higher than ambient acid temperature increases the protection current requirement substantially.
Heat exhangers have high flow rate and high acid temperature but they are constructed of stainless steel which relies on oxide layer for passivation. Current requirement of Anodic Protection is quite small.