Ukudla okunomsoco okusemathinini, ukuphepha, ukukhululeka, kufanele kube ukudla okulula kakhulu.Kodwa njengoba amathini kathayela evalwe ngokugcwele emashumini ambalwa eminyaka adlule, amathini engilazi akhethwa emabhodleleni empumelelo yesitayela saseSuzhou, kwasakazwa umyalezo wokuthi “ikani linambitheka kahle futhi nomlomo kunzima ukuwuvula”.Umbuzo omkhulu lowo.Abathengi akulula ukudla, kanye nomthelela omkhulu ekuthuthukisweni kwemboni esemathinini.Manje ukukhuthazwa okusebenzayo kwemboni yokufaka, amathini e-tinplate anesivalo esivuleka kalula, amathini engilazi anesivalo esingasikiwe.Eminyakeni engaphezu kweyishumi edlule, abantu abaningi bakhetha ukusebenzisa izivalo ezilula, okwakungamathini anephalishi eliyigugu eliyisishiyagalombili.Indawo engezansi yethini yayifakwe ithini.Izivalo ezilula zazenziwe nge-aluminium alloy futhi zazixhunywe ngesipuni esincane sepulasitiki.Ukudla kwakulula kakhulu futhi abathengi bazizwa benelisekile kakhulu, manje, umthamo wokuthengisa wonyaka we-rice pudding ekheniwe cishe amathani angu-300,000.
Kodwa-ke, akuzona zonke izinhlobo zokudla okusemathinini ezingalingiswa iphalishi le-babao elingakhethaimbiza yokudla yepulasitiki enesivalo esivuleka kalula.Eminyakeni embalwa edlule, imboni yokudla okusemathinini e-Guangdong yakhiqiza amathini ejusi katamatisi.Amathini enziwe ngensimbi ethayiwe kanye nengxubevange ye-aluminium enezivalo ezidonsa kalula, futhi okuqukethwe kwakuno-0.5% we-sodium chloride (NaCl) .Okuqukethwe kwe-chlorine kubalwe ku-303 mg/kg, ngemva kwezinyanga ezimbalwa zokugcina, ukukhiqizwa kwaphoqeleka ukuba kumiswe ngenxa yokuvuza amathangi ku-rivet kanye nomugqa wezivalo ezilula.
I-tinplate isetshenziswa ngaphansi komzimba wethini.Uma isivalo sethini senziwe nge-aluminium alloy, ibhethri elincane liyakhiwa ngemva kokuba ukudla kufakwe ethini, futhi ukusabela kwe-bimetallic kwenzeka.I-aluminium iyi-anode futhi ithini yi-cathode.Lapho indawo ye-cathode inkulu kunendawo ye-anode, ingxenye ye-anode ye-pitting ejulile yokuhlasela, kuze kube yi-perforation.Eminyakeni embalwa edlule, ithini elidumile likakhukhunathi elise-Taiwan lalenziwe ngengxube ye-aluminium enekhava evuleka kalula ne-tinplate ngaphansi kwekani.Ukuhlushwa kwama-ion e-chloride kokuqukethwe kwafinyelela ku-440 ~ 1492 mg/kg, Ph = 4.4 ~ 4.6, ikakhulukazi i-malic acid.Esigabeni sokuqala se-Canning, izakhi ezonakalisayo (i-malic acid, i-chloride ion) zigcwalisa ifilimu yokumboza futhi zenze ukusabela kwe-electrochemical.Okwamanje, ifilimu yokumboza iyi-cathode, ifilimu yokugqoka yonakaliswa ifilimu evezwe ithini, insimbi ye-anode, kuze kube yilapho indawo efanele ye-tin, insimbi ivuliwe, kanye ne-aluminium kulula ukuyidonsa ngenxa yokulimala kwentambo ye-aluminium. ndawonye ukwakha ibhethri elincane, lokusabela kwe-bimetallic.Njengamanje, i-aluminiyamu ye-anodic attack corrosion dissolusion, ehambisana nokuba khona kwe-chloride ion kokuqukethwe, ikhuthaza ukuphendula kokugqwala ukuze kusheshiswe ukuthuthukiswa kwe-aluminium alloy easy-pull cap rivet, ukubhobozwa komugqa.
Kubikwa ukuthi okunye ukudla okune-asidi ephezulu kuqukethe ama-ion e-chloride angaphezu kuka-100mg/kg, okuhlanganisa inyama ekheniwe, izinkukhu kanye nemifino yasemanzini (ngenxa yokubamba iqhaza kusawoti noma i-sodium chloride), i-tinplate isetshenziselwa phansi kwethini, futhi ingxubevange ye-aluminium ayifanele isembozo se-can, i-tinplate kufanele isetshenziswe kalula ukudonsa isivalo, ukugwema ukuvela kwe-bimetallic electrochemical reaction and perforation.
Isikhathi sokuthumela: May-10-2022