Answer
Fretting wani nau'in lalacewa ne da ke faruwa a wuraren tuntuɓar tsakanin kololuwar igiyoyin igiyar ruwa da filayen mating (misali, tseren tsere ko kafaɗun gidaje) saboda ƙarancin girma, motsin oscillatory mai girma. Wannan motsi yana kawar da shingen oxide mai kariya na karfe, wanda ke haifar da ramuka na gida da samuwar tarkace. A cikin maɓuɓɓugan ruwan raƙuman ruwa, wannan na iya haifar da tashin hankali da fashewar gajiya. Dabarun ragewa sun haɗa da: 1) Ƙara kayan aiki don rage motsin dangi. 2) Yin shafa mai busasshen fim (kamar $MoS_2$ ko PTFE). 3) Tauraruwar saman ta hanyar nitriding. 4) Yin amfani da kayan kamar Phosphor Bronze ko Copper-Beryllium don bazara idan saman mating ɗin ƙarfe ne, kamar yadda ƙarancin taurin yana rage ƙimar canja wurin kayan.
