Did Soviet publicity claim the G-5 had conquered corrosion?

Did Soviet publicity claim the G-5's alloy was corrosion-proof because sacrificial anodes were supposedly unnecessary?

Yes. G-5 publicity claimed corrosion had been conquered, despite service evidence of severe continuing maintenance demands.

Soviet publicity claimed that the G-5 had conquered corrosion and no longer needed the protection already familiar on other metal hulls. Earlier Sh-4s had nevertheless corroded badly. The G-5's reported haul-out schedule also points to a continuing maintenance burden. Claims of a corrosion-proof alloy therefore conflicted with the boats' practical upkeep.