The sinker gains no weight. http://en.wikipedia.org/wiki/Galvanic_corrosionGalvanic corrosion is a type of corrosion that occurs when two different metals are in contact with each other in the presence of an electrolyte. This can lead to a flow of electrical current between the two metals, causing one to corrode at a faster rate than the other.
In galvanic corrosion, the anode is the metal that corrodes at a faster rate, while the cathode is the metal that corrodes at a slower rate. This is because the anode has a higher tendency to lose electrons, making it more susceptible to corrosion.
Mass gain/loss is an important factor in galvanic corrosion as it indicates the extent of corrosion that has occurred. The anode will experience mass loss as it corrodes, while the cathode may experience mass gain due to the deposition of corrosion products from the anode.
Galvanic corrosion can be prevented by using metals that are close together in the galvanic series, using protective coatings or barriers between the two metals, or by using a sacrificial anode made of a more reactive metal that will corrode instead of the desired metal.
Some common examples of galvanic corrosion include the corrosion of iron nails in contact with copper pipes, the corrosion of aluminum roof panels in contact with steel support beams, and the corrosion of zinc-coated (galvanized) steel in contact with copper or brass fittings.