Galvanic corrosion is a process that degrades metals electrochemically. Increased electrical conductivity promotes electrical, galvanic and ordinary corrosion in the fuel system. Modern adhesives permit application of copper alloys to steel hulls without creating galvanic corrosion. Increased electrical conductivity promotes electric, galvanic, and ordinary corrosion in the fuel system. There are three main metals used as galvanic anodes, magnesium, aluminum and zinc. The line voltages are negative compared to earth, to reduce galvanic corrosion. Marine engineers are concerned with surface protection and preventing galvanic corrosion in every project. Salt corrosion eats away at the hull, and it is also affected by galvanic corrosion. ASTM International publishes standards on the composition and manufacturing of galvanic anodes. Passenger and Rear Loading doors were re-engineered to reduce corrosion and galvanic reaction. It is sometimes more economically viable to protect a pipeline using galvanic (sacrificial) anodes. Three methods are used in electrology&colon; Galvanic, thermolysis, and blend. In written representation of galvanic cell, "anode" is written on the "left". Batteries are typically made of six galvanic cells in a series circuit. A metallic taste may be caused by galvanic reactions in the mouth.