Igwe anaghị agba ncharabụ igwe anaghị agba nchara angular urughuru.Ọtụtụ na-eji n'elu ihicha, agba wepụ na descaling nke na-abụghị ferrous ọla na igwe anaghị agba nchara ngwaahịa, akpụ edo n'elu roughness, otú karịsịa adabara elu pretreatment tupu mkpuchi.