High temperature aluminum alloy sacrifice anode

High temperature aluminum alloy sacrifice anode

At high temperature, the oxide film on the surface of aluminum is more dense, so with the increase of temperature, the potential of aluminum anode is moving forward, and at high temperature, there is serious intergranular corrosion of aluminum alloy, the grain becomes larger, fall off later, and lead to the reduction of current efficiency, so the sacrificial anode material with superior performance at room temperature is not applicable in high environment.

Through the study of the chemical properties of aluminum anode at high temperature, the application surface of zinc and aluminum anode in recent two years shows that the properties of zinc and aluminum anode at high temperature change, zinc anode and aluminum anode at high temperature corrosion state. It is found that the sensitivity of zinc anode to intercrystalline corrosion increases with the increase of temperature, and the efficiency is greatly reduced, and some can produce potential reversal state, so the zinc anode is not suitable at high temperature. And the aluminum alloy anode BA778, in the 20℃--100℃ test performance should be better at 75℃, 15%NaCl solution, capacitance can reach 2095A•h/kg, current efficiency of 70%, it is reported that BA778 anode can work at 50℃-100℃, and become commercial production and sale, At 75℃, BA780,(Al, Zn,In,Mg,Ti and Al,Sn,Bi; Al,Sn,Zn), especially Al-Zn-in-Sn-Bi and Al-Zn-in-Sn-Ti, are suitable for sacrificial anodes at high temperature. The refining effect of rare earth elements on grains greatly improves the performance of aluminum anodes at high temperature

High efficiency aluminum sacrifice anode

In high resistivity of corrosive medium, easy formation on the surface of aluminum anode work protective passive film, anode potential is moving, and encourage effective starting voltage is reduced, anodic dissolution quantity is little, electrical output flow less, can't meet the requirements of high resistivity medium cathodic protection, limit the promotion and application of sacrificial anode, the sacrificial anode have material price is high, The less efficient magnesium alloy sacrifices the anode. According to the properties and characteristics of aluminum alloy, by adding trace activated alloying elements, a high activated aluminum anode without Ca and Zn was developed, which solved the problem well.

High activation performance aluminum anode with negative potential and stability, suitable for sea water, crude oil storage tank applications.

The highly activated aluminum anode (Al-Zn-in-Mg-Ti) dissolves In the tank and produces a large amount of white corrosion, which automatically disperses into the solution. At the bottom of the tank, no insoluble and partially dissolved metal particles are found to fall off into the solution. The anode working surface is exposed to obvious metal surface without cleaning, and no corrosion products are attached. It is the most ideal sacrificial anode for cathodic protection tanks