There should still be some galvanic corrosion even if it is stainless steel.
There are ways around this but I tend to think they have not instituted any of them.
See here.
Quote:
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Galvanic corrosion occurs when two dissimilar metals are placed in contact with each other in the presence of an electrolyte, such as salt water, resulting in the unintentional formation of a galvanic cell and concomitant chemical reaction of the metals involved. There are several ways of reducing and preventing this form of corrosion. One way is to electrically insulate the two metals from each other, for example by using plastic or fibre washers to separate steel water pipes from copper-based fittings or by using a coat of grease to separate aluminum and steel parts. Another way is to keep the metals dry and/or shielded from ionic compounds (salts, acids and bases), for example by encasing the protected metal in plastic or epoxy. Another method, called "cathodic protection", uses one or more sacrificial anodes made of a metal which is more active than the protected metal. Metals commonly used for sacrificial anodes include zinc, magnesium, and aluminum. Finally, an electrical power supply may be connected to oppose the corrosive galvanic current. (see Impressed-Current Cathodic Protection)
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Unfortunately my chemistry has gotten rusty recently and I don't remember where to find the data tables at the moment.
Give me a bit and I will see what I can come up with.