Nepo tsvina yekuchengetedza yakanyorova kana kuti 'white rust' isingambokanganise simba rekudzivirira rejasi rine galvanized, i aesthetic blight iri nyore kudzivirira.

Kunyorova kwekuchengetera tsvina kunoitika kana zvichangobva kugadzikiswa zvinhu zvakaiswa kune hunyoro senge mvura, dova kana condensation (yakakwirira humidity), uye inoramba iri munzvimbo ine mhepo shoma pamusoro penzvimbo.Aya mamiriro anogona kukanganisa kuti patina inodzivirira inoumbwa sei.

Kazhinji, zingi rinotanga kuita neokisijeni kuumba zinc oxide, uye nekunyorova kuumba zinc hydroxide.Nekufambiswa kwemhepo kwakanaka, zinc hydroxide inobva yashanduka kuita zinc carbonate kuti ipe dziviriro ku zinc, nokudaro ichideredza kukora kwayo.Nekudaro, kana zinc isingakwanise kuwana mhepo inoyerera-yemahara uye ichiramba yakavhurika kune hunyoro, iyo zinc hydroxide inoramba ichikura panzvimbo uye inoumba tsvina yekuchengetedza.

Ngura chena inogona kukura kwemavhiki kana kunyange kwehusiku humwe kana mamiriro akanyatsonaka.Munzvimbo dzakakomba dzemahombekombe, tsvina yekuchengetedza yakanyorova inogonawo kuitika kubva kune yakavakirwa-mhepo yemunyu madhipoziti inotora hunyoro mukati mehusiku.

Imwe simbi inogona kugadzira rudzi rwetsvina yekuchengetera mvura inozivikanwa se'black spotting', inoita semakwapa akasvibira ane kana asina chena upfu hwakatenderedza.Rudzi urwu rwemvura yekuchengetera tsvina inowanzoitika pamagetsi emagetsi akajeka semashiti, purlins uye matete-walled hollow zvikamu.Zvakanyanya kuoma kuchenesa pane zvakajairwa mafomu ewhite rust, uye dzimwe nguva kupenya kungangove kuchiri kuoneka mushure mekuchenesa.