Amakhoyili ensimbi ayisithako ukuvikela ukugqwala ebusweni beshidi lensimbi futhi andise isikhathi sokusebenza kwawo.Ingaphezulu lekhoyili yensimbi limbozwe ungqimba lwezinc zensimbi.Lolu hlobo lwekhoyili yensimbi lubizwa ngokuthi ikhoyili eyisithako.
Ngokwezindlela zokukhiqiza nokucubungula,ikhoyili yensimbiingahlukaniswa “ngamakhoyili ensimbi ashisayo-dip”, “amakhoyili ensimbi kagesi”, “ikhoyili yensimbi enohlangothi olulodwa nezinhlangothi ezimbili”, “ikhoyili yensimbi enombala”, njll.
Ikhoyili yeshidi lensimbi elidiphu elishisayo.Ipuleti lensimbi elincanyana licwiliswa ku-zinc encibilikisiweichibi, ukuze ungqimba oluncane lwe-zinc lunamathele phezulu.Njengamanje, ikhiqizwa ikakhulukazi inqubo eqhubekayo yokufaka ama-galvanizing, okungukuthi, ukucwiliswa okuqhubekayo kwamashidi ensimbi agingqelwe echibini elinothayela.nge-zinc encibilikisiwe ukwenza amakhoyili ensimbi.