Studi ekstrak daun salam syzygium polyanthum dan buah salak banjarnegara salacca zalacca var banjarnegara sebagai inhibitor korosi ramah lingkungan pada baja karbon rendah api 5L grade B dalam larutan asam HCL 1 M = Study the extract of indonesian bay leaf syzygium polyanthum and snake fruit var Banjarnegara salacca zalacca var banjarnegara as enviromental friendly inhibitor on carbon steel api 5L grade B in 1M hydrochloric acid solution