UPhando loKunyangwa kokuRhakala kwe-Hot dipped Galvalume Coating

Iingubo zegalvalume ze-Zn55Al1.6Si ezidiphu zishushu zisetyenziswe ngokubanzi kwiindawo ezininzi ezifana neshishini lemoto, ukwakhiwa kweenqanawa, ishishini loomatshini njl. ixabiso le-Al lingaphantsi kwe-Zn okwangoku). Umhlaba onqabileyo onje ngeLa unokuthintela ukukhula kwesikali kunye nokwandisa ukunamathela kwesikali, ngenxa yoko baye baqeshwa ukukhusela iintsimbi kunye nezinye. zetsimbi i-alloys ngokuchasene ne-oxidation kunye nokuhlwa. Noko ke, kukho iincwadi ezimbalwa kuphela ezipapashiweyo ngokusetyenziswa kwe-La kwi-galvalume eshushu editshiweyo yokwaleka, kwaye kweli phepha iziphumo zokongezwa kwe-La kwi-corrosion resistance of the hot-dipped galvalume coating zaphandwa.

Uvavanyo

[1] Hot-dipping

I-Hot-dipped Zn-Al-Si-La i-alloy coatings equkethe i-0,0.02wt.%, 0.05wt.%, 0.1wt.% kunye ne-0.2wt.% La isetyenziswe kwi-Ф 1 mm ucingo lwensimbi oluthambileyo. Inkqubo yaba ngolu hlobo lulandelayo: ukucoca ukususa umhlwa kunye nokuthambisa ngamaza angaphezulu (55 °C)→ukucoca ngamanzi→ ukuguquguquka(85°C)→ukoma (100~200 °C) ukudipha kushushu(640~670 °C, 3～5 s).

[2] Uvavanyo lokunciphisa umzimba

Uvavanyo lokulahlekelwa kwesisindo lulinganiswa ngobhedu olukhawulezayo lwe-acetic acid yokuvavanya ityuwa yetyuwa (CASS) kunye neemvavanyo zokucwiliswa kwe-corrosion eyenziwa kwigumbi lokutshiza ityuwa kunye ne-3.5% yesisombululo se-NaCl. Emva kweemvavanyo, iimveliso ezitshabalalisayo zisuswe ngeendlela zoomatshini, zihlanjululwe ngamanzi asebenzayo, zize zomiswe ngomoya obandayo obandayo kunye nokulahlekelwa kwesisindo esilinganiswe ngumlinganiselo we-elektroniki. Kuzo zombini ezi meko, ezintathu paraliisampuli ze-lel zenziwe ukufumana iziphumo ezichanekileyo. Ixesha lovavanyo yayiyi-120 h yovavanyo lwe-CASS kunye ne-840 h yovavanyo lokuntywiliselwa.

[3] Uvavanyo lwe-Electrochemical

Uvavanyo lwe-electrochemical lwenziwa yi-IM6e ye-electrochemical work station ebonelelwa yiJamani, ithatha ipleyiti yeplatinam njenge-counter electrode, i-calomel electrode egcweleyo njenge-electrode yereferensi, kunye ne-Zn-Al-Si-La yokwambathisa obushushu bentsimbi ethambileyo njenge-electrode esebenzayo. I-corroding medium yayiyi-3.5% yesisombululo se-NaCl. Indawo engaphezulu evezwe kwisisombululo sovavanyo yayiyi-1cm2. Imilinganiselo ye-Electrochemical impedance spectroscopy (EIS) yaqhutywa kunye noluhlu lwamaza ukusuka kwi-10 kHz ukuya kwi-10 mHz, ububanzi besignali yombane we-sinusoidal yayiyi-10 mV (rms) . ukuya kuma-70 mV, izinga lokuskena laliyi-70 mV/s. Kuzo zombini iimeko, uvavanyo aluzange luqale de amandla okubola ahlala azinzile (utshintsho olungaphantsi kwe-1 mV kwi-5 min).

[4] Izifundo ze-SEM kunye ne-XRD

I-Surface morphologies yeesampulu zavavanywa yi-SSX-550 yokuskena i-electron microscope (SEM) emva kovavanyo lwe-corrosion kwigumbi lokutshiza ityuwa kunye ne-3.5% yesisombululo se-NaCl. Iimveliso ze-corrosion ezenziwe kumphezulu weesampuli kwi-spray yetyuwa kunye ne-3.5% isisombululo se-NaCl savavanywa ngokusebenzisa i-PW-3040160 X-ray diffraction (XRD).

Iziphumo neengxoxo

[1] Ukumelana nokubola
[1.1] Ukunciphisa umzimba
Umzobo we-1 ubonisa iziphumo zovavanyo lokulahlekelwa kwesisindo kwikhabhinethi yokutshiza ityuwa kunye ne-3.5% yesisombululo se-NaCl. Izinga lokubola kweesampulu kuzo zombini iimeko liye lehla okokuqala ngokunyuka komxholo we-La ukuya kwi-0.05wt.% kwaye yanda ngokunyuka okungaphezulu komxholo we-La. Ke ngoko, olona xhathiso lokuthotywa lufunyenwe kwiingubo eziqulathe i-0.05wt.%La. Kwafunyaniswa ukuba ngexesha lovavanyo lokuntywiliselwa, umhlwa obomvu wafunyanwa kwangoko kwi-0wt.%La umphezulu wokugquma kwisisombululo se-3.5% seNaCl, nangona kunjalo, de kwaphela uvavanyo lokuntywiliselwa, kwakungekho mhlwa obomvu kwi-0.05wt.% .

2.1.2 Uvavanyo lwe-Electrochemical

Umzobo we-2 ubonisa i-polarization curves ebuthakathaka kwiingubo ze-alloy Zn-Al-Si-La kwi-3.5% isisombululo se-NaCl. Ingabonwa ukuba imilo ye-polarization curves ebuthathaka ibonise ukungafani okumbalwa, kunye nenkqubo yokubola kwazo zonke iintlobo zeengubo ze-alloy zilawulwa yi-cathodic reaction. Iziphumo ezifanelekileyo ze-Tafel ezisekelwe kwii-curves ze-polarization ezibuthathaka kwi-Fig.2 zichazwe kwiThebhile 1. Ngokufana novavanyo lokulahlekelwa kwesisindo, kwafumaniseka ukuba ukuxhatshazwa kwe-corrosion ye-coating ye-galvalume kunokuphuculwa ngokudibanisa okuncinci kweLa kunye nobuncinci. isantya sokutya sifunyenwe nge-0.05wt.%La.

I-Fig.3 imele i-Nyquist diagrams erekhodwe kwiingubo ngeemali ezahlukeneyo zokongezwa kwe-La evezwe kwi-3.5% isisombululo se-NaCl se-0.5 h. Kuzo zonke iimeko, bekukho ii-arcs ezimbini ezithetha ukuguquguquka kwamaxesha amabini. Lo ubonakala kwi-frequency ephezulu imele uphawu lwe-dielectric yokwaleka kwe-alloy, ngelixa enye i-low frequency ihambelana naleyo ye-substrate yentsimbi ethambileyo kwi-pores (okt iziphene zoKugquma). Njengoko ukongezwa kweLa kwanda, ububanzi be-arc ye-frequency ephezulu yonyuka, esi siphumo sacaciswa ngakumbi kwimeko ye-Zn55Al1.6Si0.05La i-alloy coating. Ngokunyuka ngakumbi umxholo we-La, nangona kunjalo, ububanzi be-arc frequency yehla ngokuphambeneyo. Okwangoku, i-center of all the arcs ixhomekeke kwi-quadrant yesine, ebonisa ukuba umphumo wokusasazeka kwenzeka kwi-electrode surface.Ngaphantsi kwesi simo, iziphumo ezingcono zingafumaneka ngokusebenzisa i-CPE (isigaba sesigaba esisisigxina) endaweni ye-capacitance ecocekileyo eyaboniswa ngu. amanye amaqela ophando.