Uma kuziwa kumabhodi wesifunda aphrintiwe, asikwazi ukukhohlwa indima ebalulekile yezinto ezisizayo.Njengamanje, i-solder ye-tin-lead esetshenziswa kakhulu kanye ne-lead-free solder.Edume kakhulu i-63Sn-37Pb eutectic tin-lead solder, okube yinto ebaluleke kakhulu yokudayiswa nge-elekthronikhi cishe iminyaka eyi-100.
Ngenxa yokumelana kwayo kahle ne-oxidation ekamelweni lokushisa, ithini iyinsimbi encibilikayo ephansi enokwakheka okuthambile, kanye nokudumba okuhle.Umthofu awuyona nje insimbi ethambile enezinto zamakhemikhali ezizinzile, ukumelana ne-oxidation, nokumelana nokugqwala, kodwa futhi unokubumba okuhle, nokusakazwa, futhi kulula ukucutshungulwa nokubunjwa.Umthofu kanye nethini kunokuncibilika okuhle nokuvumelana.Ukwengeza izilinganiso ezihlukene zomthofu ethini kungakha ithenda eliphezulu, elimaphakathi, neliphansi lokushisa.Ikakhulukazi, i-63Sn-37Pb eutectic solder ine-conductivity kagesi enhle kakhulu,, ukuzinza kwamakhemikhali, izakhiwo zemishini kanye nokucutshungulwa, indawo encibilikayo ephansi namandla ahlangene we-solder, iyinto efanelekile yokuthengiswa kwe-elekthronikhi.Ngakho-ke, i-tin ingahlanganiswa nomthofu, isiliva, i-bismuth, i-indium nezinye izakhi zensimbi ukuze zenze i-solder yokushisa ephezulu, ephakathi nendawo ephansi yezinhlelo zokusebenza ezihlukahlukene.
Izakhiwo eziyisisekelo zomzimba namakhemikhali ethini
Ithini iyinsimbi ecwebezelayo esiliva-emhlophe futhi imelana kahle ne-oxidation ekamelweni lokushisa futhi igcina ukucwebezela kwayo lapho ichayeke emoyeni: inokuminyana okungu-7.298 g/cm2 (15) nendawo yokuncibilika engu-232, iyiphoyinti elincibilikayo lensimbi. ngokuthungwa okuthambile kanye ne-ductility enhle.
I. Isimo sokushintsha kwesigaba sethini
Iphuzu lokushintsha kwesigaba sethini ngu-13.2.i-boron tin emhlophe ezingeni lokushisa eliphakeme kunephuzu lokushintsha kwesigaba;lapho izinga lokushisa liphansi kunephuzu lokushintsha kwesigaba, liqala ukuphenduka libe yimpushana.Lapho ukuguqulwa kwesigaba kwenzeka, ivolumu izokhuphuka cishe ngama-26%.Ukushintsha kwesigaba sokushisa okuphansi kwe-tin kubangela ukuthi i-solder ibe brittle futhi amandla acishe anyamalale.Izinga lokushintsha kwesigaba lishesha kakhulu ezizungeze -40, futhi emazingeni okushisa angaphansi kuka -50, ithini lensimbi lishintsha libe ithini elimpunga elimpunga.Ngakho-ke, ithini elihlanzekile alikwazi ukusetshenziselwa ukuhlanganiswa kwe-electronic.
II.Amakhemikhali e-tin
1. Ithini inokumelana nokugqwala okuhle emkhathini, akulula ukulahlekelwa ukucwebezela, okungathinteki ngamanzi, umoya-mpilo, i-carbon dioxide.
2. Ithini lingamelana nokugqwala kwe-organic acid futhi linokumelana okuphezulu nezinto ezingathathi hlangothi.
3. Ithini iyinsimbi ye-amphoteric futhi ingasabela ngama-asidi aqinile nezisekelo, kodwa ayikwazi ukumelana ne-chlorine, i-iodine, i-caustic soda ne-alkali.
Ukugqwala.Ngakho-ke, kumabhodi omhlangano asetshenziswa ezindaweni ezine-asidi, i-alkaline ne-salt spray, i-anti-corrosion coating iyadingeka ukuze kuvikelwe amalunga e-solder.
Kukhona okuhle nokubi, lezi yizinhlangothi ezimbili zohlamvu lwemali.Ukuze PCBA yokukhiqiza, kubalulekile ukuba ucabangele indlela ukukhetha ilungelo tin-lead solder noma ngisho nomthofu-free solder ngokusho imikhiqizo ehlukene ekulawuleni izinga.
Isikhathi sokuthumela: Dec-21-2021