Nzira yekudzivirira sei kuora kwechimiro chesimbi?
Nekuwedzera kwakasimba kwekubuda kwesimbi, zvigadziro zvesimbi zvinowedzera kufarirwa.Inoshandiswa zvakanyanya seimba yekuchengetera zvinhu, workshop, garaji, prefab apartment, shoping mall, prefab stadium, etc.Kufananidzwa neyakasimbiswa kongiri zvivakwa, simbi chimiro zvivako zvine zvakanakira kuvaka zviri nyore, kuita zvakanaka seismic kuita, kushoma kusvibiswa kwezvakatipoteredza uye kushandiswazve.Zvisinei, zvivako zvesimbi zviri nyore kuita ngura, saka anti-corrosion inokosha zvikuru kune zvivako zvesimbi.
Mhando dzekuora dzezvivakwa zvesimbi dzinosanganisira ngura yemuchadenga, corrosion yemunharaunda uye kusagadzikana kwemarara.
(1) Kuora kwemhepo
Atmospheric corrosion yezvimiro zvesimbi inonyanya kukonzerwa nemakemikari uye electrochemical mhedzisiro yemvura uye okisijeni mumhepo.Mhepo yemvura mumhepo inoumba electrolyte layer pamusoro pesimbi, uye okisijeni iri mumhepo inonyungudika mairi se cathode depolarizer.Vanoumba galvanic cell inokosha ine zvinhu zvesimbi.Mushure mekunge ngura yaumbwa pamusoro penhengo dzesimbi nekuora kwemuchadenga, zvigadzirwa zvekuora zvinokanganisa maitiro e electrode emumhepo.
(2) Ngura yomunzvimbomo
Corrosion yemunharaunda ndiyo inonyanya kuwanikwa muzvivakwa zvesimbi, kunyanya galvanic corrosion uye crevice corrosion.Galvanic corrosion inonyanya kuitika pamisanganiswa yesimbi yakasiyana kana kubatanidzwa kwezvivakwa zvesimbi.Simbi ine simba rakaipa rinoita ngura nekukurumidza, nepo simbi ine simba rakanaka inodzivirirwa.Masimbi maviri aya anoumba galvanic cell.
Crevice corrosion inowanzoitika mumitsetse yepasi pakati pemitezo yakasiyana yesimbi uye pakati penhengo dzesimbi uye dzisiri simbi.Kana hupamhi hwemugodhi huchigona kuita kuti mvura imire mumugodhi, iyo inonyanya kunzwisiswa mufarwa wesimbi chimiro crevice corrosion ndeye 0.025 ~ o.1mm.
(3) Stress ngura
Mune imwe svikiro, chimiro chesimbi chine ngura shoma kana isiri pasi pekunetseka, asi mushure mekuiswa pasi pekunetsekana, chikamu chinoputsika kamwe kamwe mushure menguva yenguva.Nekuda kwekuti hapana chiratidzo chiri pachena chekunetsekana nekutyoka kusati kwaitika, kazhinji kunotungamira kune njodzi, sekudonha kwebhiriji, kubuda kwepombi, kuputsika kwechivako uye zvichingodaro.
Zvinoenderana neiyo corrosion mechanism yechimiro chesimbi, kukora kwayo imhando yekukuvara kusina kuenzana, uye iyo corrosion inokura nekukurumidza.Kamwe chete pamusoro pechimiro chesimbi chasvibiswa, gomba rekuora rinokura nekukurumidza kubva pasi pegomba kusvika pakadzika, zvichikonzera kushushikana kwechimiro chesimbi chimiro, icho chinomhanyisa kukora kwesimbi, inova denderedzwa rakashata.
Corrosion inoderedza kutonhora kwe brittleness kuramba uye kuneta simba resimbi, zvichiita kuti kamwe kamwe brittle kuputsika kwezvinhu zvinotakura zvinhu pasina zviratidzo zviri pachena zve deformation, zvichikonzera kuparara kwezvivako.
Nzira yekudzivirira yesimbi yekugadzira corrosion
1. Shandisa simbi inodzivirira mamiriro ekunze
Yakaderera alloy simbi yakatevedzana pakati peyakajairika simbi uye Stainless simbi.Simbi yemamiriro ekunze inogadzirwa nekabhoni simbi yakajairwa ine hushoma hwezvinhu zvinodzivirira kukora semhangura uye nickel.Iine maitiro ekusimba uye kuoma, kuwedzera kwepurasitiki, kuumba, kusungira uye kucheka, abrasion, kupisa kwakanyanya uye kuneta kuramba kwesimbi yepamusoro;Kupokana kwemamiriro ekunze ndeye 2 ~ 8 nguva yeyakajairwa kabhoni simbi, uye kuita kwekupotera kuri 1.5 ~ 10 nguva yeyakajairika kabhoni simbi.Panguva imwecheteyo, ine maitiro ekudzivirira ngura, kusagadzikana kwemarara kwezvikamu, kuwedzera kwehupenyu, kuonda uye kuderedza kushandiswa, kuchengetedza basa uye kuchengetedza simba.Weathering simbi inonyanya kushandiswa kune zvivakwa zvesimbi zvakaratidzwa mumhepo kwenguva yakareba, senge njanji, mota, mabhiriji, shongwe uye zvichingodaro.Inoshandiswa kugadzira midziyo, mota dzechitima, dhiriki dzemafuta, zvivakwa zvechiteshi chengarava, mapuratifomu ekugadzira oiri uye midziyo ine hydrogen sulfide inoparadza midhiya mumakemikari uye petroleum michina.Kusimba kwaro kwepasi-tembiricha kusimba kuri nani pane iyo yeyakajairwa simbi yekugadzira.Iyo chiyero ndeyekupisa simbi yezvivakwa zvakasungwa (GB4172-84).
Iyo amorphous spinel oxide layer inosvika 5O ~ 100 m gobvu yakaumbwa pakati peiyo ngura uye matrix yakakora uye ine yakanaka adhesion nesimbi yematrix.Nekuda kwekuvapo kweiyi dense oxide film, inodzivirira kupinza kweokisijeni nemvura mumhepo mukati mesimbi matrix, inoderedza kudzika kwakadzika kwekuora kusvika kune zvigadzirwa zvesimbi, uye inovandudza zvakanyanya kusimba kwemhepo yemhepo yesimbi zvinhu.
2. Kupisa dip galvanizing
Kupisa dip galvanizing corrosion kudzivirira ndiko kunyudza iyo workpiece kuti iputirwe musimbi yakanyungudutswa zinc yekugezera yekuputira, kuti igadzire yakachena zinc coating pamusoro peiyo workpiece uye zinc alloy coating pane yechipiri pamusoro, kuti uzive. kuchengetedzwa kwesimbi nesimbi.
3. Arc spraying anticorrosion
Kupfapfaidza kweArc kushandisa midziyo yekupfapfaidza yakasarudzika kunyungudutsa waya yesimbi yakapfapfaidzwa pasi pekuita kwemhepo yakaderera uye yakakwira ikozvino, wobva wapfapfaidza kune zvikamu zvesimbi pre sanded uye derusted nemhepo yakamanikidzwa kuita arc sprayed zinc uye aluminium coatings, ayo ari. yakapfapfaidzwa ne-anti-corrosion sealing coatings kuti igadzire kwenguva yakareba anti-corrosion composite coating.Iyo yakakora coating inokwanisa kudzivirira iyo inopisa svikiro kuti isanyure mu substrate.
Hunhu hwearc kupfapfaidza anti-corrosion ndeiyi: iyo yekupfeka ine yakakwira adhesion, uye kunamatira kwayo hakuenzaniswi nependi yakapfuma ye zinc uye inopisa-dip zinc.Migumisiro yekukanganisa kupeta bvunzo pane workpiece inobatwa nearc spraying anti-corrosion kurapwa kwete chete zvakakwana kusangana nezvinodiwa, asi inozivikanwawo se "laminated simbi ndiro";Iyo anti-corrosion nguva yearc yekupfapfaidza coating yakareba, kazhinji 30 ~ 60A, uye ukobvu hwekuputira hunotaridza hupenyu hwekudzivirira-kuora kwejasi.
4. Anti corrosion of thermal sprayed aluminum (zinc) composite coating
Thermal spraying aluminium (zinc) composite coating inzira yenguva refu yekudzivirira kukoromoka ine mhedzisiro yakafanana neyekupisa-dip galvanizing.Nzira yacho ndeyekubvisa ngura pamusoro penhengo yesimbi nekuputika kwejecha, kuitira kuti nzvimbo yacho ionekwe nesimbi inopenya uye yakasvibiswa;Zvadaro shandisa acetylene okisijeni murazvo kunyungudutsa anoramba akatumira aruminiyamu (zingi) waya uye kuifuridzira pamusoro penhengo simbi ine compressed mweya kuita muzinga aruminiyamu (zingi) spraying layer (ukobvu anenge 80 ~ 100m);Pakupedzisira, ma pores anozadzwa ne epoxy resin kana neoprene pendi kuti iite jira rinoumbwa.Thermal sprayed aluminum (zinc) composite coating haigoni kuiswa mukati memadziro emukati metubular nhengo.Naizvozvo, migumo yese yenhengo dzetubular dzinofanirwa kuvharwa nemhepo kudzivirira ngura pamadziro emukati.
Kubatsira kweiyi nzira ndeyokuti ine simba rinogadziriswa nehukuru hwezvikamu, uye chimiro uye hukuru hwezvikamu zvinenge zvisingagumi;Imwe bhenefiti ndeyekuti thermal mhedzisiro yemaitiro ndeyemunharaunda, saka zvikamu hazvibudise thermal deformation.Kana ichienzaniswa nekupisa-dip galvanizing, iyo maindasitiri dhigirii remafuta ekupfapfaidza aluminium (zinc) yakasanganiswa coating yakaderera, kusimba kwekushanda kwejecha kuputika uye aluminium (zinc) kupfapfaidza kwakakwira, uye hunhu hunokanganiswawo nyore nekushanduka kwemanzwiro kwevanoshanda. .
5. Kuvhara anticorrosion
Iyo yekuputira anti-corrosion yesimbi chimiro inoda maitiro maviri: base kurapwa uye kupfekedza kuvaka.Chinangwa che base kosi kurapwa ndechekubvisa burr, ngura, tsvina yemafuta uye zvimwe zvakabatanidzwa pamusoro pezvikamu, kuitira kuburitsa simbi inopenya pamusoro pezvikamu;Iyo yakanyanya kunyatso kurapa kwechigadziko, zviri nani iyo adhesion athari.Iwo ekutanga maitiro ekurapa anosanganisira manyore uye mechani kurapwa, kemikari kurapwa, mechaniki yekupfapfaidza kurapwa, nezvimwe.
Kana iri yekuvaka yekupfekedza, nzira dzinowanzo shandiswa dzekubhurasha dzinosanganisira nzira yekubhurasha yemanyorero, manyorerwo ekukungurusa nzira, dip coating method, air spraying method uye airless spraying method.Inonzwisisika brushing nzira inogona kuve nechokwadi chemhando, kufambira mberi, kuchengetedza zvinhu uye kuderedza mutengo.
Panyaya yekupfekedza chimiro, kune matatu mafomu: primer, yepakati pendi, primer, primer uye primer.Iyo primer inonyanya kuita basa rekunamatira uye kudzivirira ngura;Iyo topcoat inonyanya kuita basa rekurwisa-corrosion uye anti-kukwegura;Basa repakati pepende riri pakati pekutanga uye kupera, uye rinogona kuwedzera firimu rehupamhi.
Chete apo iyo primer, jasi repakati uye jasi repamusoro rinoshandiswa pamwe chete vanogona kutamba basa rakanakisa uye kuwana mhedzisiro yakanaka.
Nguva yekutumira: Mar-29-2022