There is a second problem associated with fretting. The ceramic oxide that is removed imbeds its self into the rubber part causing a wear or grinding action on the base metal. Stainless steel protects its self by forming a protective oxide called chrome oxide, one of the hardest ceramics. The hard ceramic that we removed sticking into the rubber or Teflon causing a grinding action. Replace bearing lip or grease seals with labyrinth or the newer positive face seals.
Face seals are the better choice.
Stop putting packing into pumps. You don't need that kind of leakage any more. Do not use mechanical seals that are designed with a dynamic elastomer positioned on the pump shaft or sleeve. Most original equipment seals are designed this way. Stationary cartridge seals, most balanced O-ring seals and all bellows seals eliminate the shaft dynamic elastomer and the fretting associated with it.