357 Corrosion

In the April 2011 edition of the magazine Modern Railways, a report on the refurbishment of the Class 357 Stock used on the c2c services running east of London to Tilbury, Southend and Shoeburyness, mentioned a problem with corrosion where steel bolts had been used to secure external aluminium panels.  It seems extraordinary to me that 50 years after reports of corrosion caused by using steel rivets in the construction of aluminium-bodied freight wagons, people are still having trouble mixing aluminium and steel in the same construction.  Doesn't anyone do any research any more?  Doesn't anyone study basic metallurgy any more?