Answer
Fretting corrosion kan uumamu bakka tuttuqaa (crests and troughs) spring wave irratti yeroo sochiin firaakshinii daqiiqaa, frequency ol’aanaa spring fi mating surfaces gidduutti jiraatudha. Sochiin kun laayibara oksaayidii eegumsaa sibiilicha irratti argamu caccabsee, oksaayidii saffisaa fi uumamuu ‘caccabaa fretting’ (yeroo baay’ee daakuu diimaa ykn gurraacha gaarii) fida. Yeroo teardown, kun akka localized pitting ykn 'scuffing' ta'ee olka'iinsa dalgaa irratti mul'ata. Boolli akka dhiphina walitti qabuutti waan hojjetuuf, fretting dadhabbiin akka hin mudanneef dursa. Kana salphisuuf, injinarroonni dibata fiilmii goggogaa (akka $MoS_2$) ykn PTFE coating, kan koofiishinii wal-nyaatinsaa hir’isuu fi tuttuqaa sibiilaa fi sibiilaa adeemsa fretting oofu ittisu ibsuu danda’u.
