There are two main methods to retard the corrosion of steel structures using cathodic protection technology:
First, Sacrificial anode cathodic protection
Sacrificial anode cathodic protection is to connect or weld the metal or alloy with negative potential on the metal structures, such as aluminum, zinc or magnesium. The anode material is constantly consumed, and the current released is supplied to the protected metal structure and cathodic polarization, thus realizing protection.
Second, applied current cathodic protection
By applying direct current to the protected metal, the cathodic current is passed to make it cathodically polarized. Previously, sacrificial anode cathodic protection method is generally adopted for the inner wall of separator, but the temperature of the inner wall of separator is high, the composition of water deposited on the inner wall is complicated, and the water quality may be acidic or alkaline. Therefore, the life of sacrificial anode protection is short, generally less than half a year that is consumed. Sacrificial anode protection also exists protection dead zone. On the other hand, the cathodic protection potential of sacrificial anode cannot be measured, the protection current cannot be adjusted, and the length of protection life cannot be predicted.
In order to overcome the short service life and uneven protection of the sacrificial anode cathodic protection method, Shaanxi U-Tron Technology cooperates with some companies with strong scientific research strength and develops an applied current cathodic protection method for the inner wall of the separator.
The number of anodes required is calculated according to the size and area of each chamber, the composition and content of electrolyte in the sewage and the required protection current density, and the titanium-based tubular mixed-metal-oxide anode is fixed as the auxiliary anode on a certain-height bracket in the aqueous phase at the bottom of the separator, and the silver/silver chloride reference electrode or high-purity zinc reference electrode is used. All the cables in the tank are led out through the special safety and leakage-proof connector, and then led to the corresponding contact point of the constant potential meter.
Third, the inner wall anticorrosion cathodic protection with (auxiliary) anode
Mixed metal oxide tubular anode is used for cathodic protection with additional current. Three 25*700mm anodes are installed in each separator, 1-2 anodes are installed in each cavity, and the anodes are installed with brackets, the height of which is more than 300, and the original fixing points in the separator are used, but it is necessary to ensure that the anodes are insulated from the body of the separator. The reference electrode is installed on the tank wall in the same way as the mixed metal oxide anode.
Anode specification size: generally rod-shaped and tubular
Current density: 20-500a/sqm
Connecting cables can be welded, and several of them form anode strings.
Baoji Highstar Titanium Metal Co.,Ltd
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