Answer
Mu mpeta izenguruka, impinduka nyinshi ziri hafi, zikora umwanya wa capillary. Mu gutunganya imiti, amazi arashobora gukururwa muri uyu mwanya hanyuma agafatwa. Niba ayo mazi yangirika, biganisha kuri 'crevice corrosion,' aho kubura ogisijeni birinda ivugurura ryimyuka ya oxyde ya pasitoro ku byuma bitagira umwanda. Ibi bitera kwihuta hagati yumurongo. Igihe kirenze, ibyobo bigabanya igice cyambukiranya igice cyimpeta, biganisha ku gutungurwa gutunguranye munsi yumutwaro usanzwe. Kwipimisha byerekana ibyobo byimbitse cyangwa 'tunnel' hagati yimpinduka mugihe isura yinyuma ishobora kugaragara neza. Kugabanya ubukana bisaba gukoresha ibinyobwa bidashobora kwangirika cyane nka Hastelloy cyangwa kwemeza ko impeta zashizwemo neza kandi wenda zashizwemo na PTFE-ruswa-ibuza polymer.
