Patent ID: 7044075

Claim:
In a marine vessel adapted to float on a body of water and having at least one metal part submerged within a body of water when said marine vessel is floating therein, the improvement comprising a corrosion control system comprising: a) at least one sacrificial anode connected to (1) said at least one metal part, and (2) to a ground; b) an electrical circuit including: i) a source of electrical current; ii) a further anode immersed in said body of water and connected to said source; iii) controller means for controlling application of electrical current from said source to said further anode, said controller means comprising a microcontroller; iv) switch means for controlling electrical connection between said sacrificial anode and ground, and an actuator for said switch means operated by said controller means; v) means for sensing a malfunction in operation of said controller means; c) whereby when said malfunction sensing means senses a malfunction in operation of said controller means, said switch means is caused to close connection between said sacrificial anode and ground.