Galvanizing
Hunhu:
Zinc inogara zvakanaka mumhepo yakaoma uye haichinji ruvara zviri nyore. Munzvimbo dzine mvura uye dzine hunyoro, inosangana neokisijeni kana kabhoni dioxide kugadzira oxide kana alkaline zinc carbonate films, izvo zvinogona kudzivirira zinc kuti isarambe ichidonha uye kudzivirira.
Zinc inonyanya kukanganiswa nengura mumaacid, alkalis, uye sulfides. Galvanized layer inowanzo fanirwa kurapwa ne passivation. Mushure mekupasiswa mu chromic acid kana chromate solution, firimu re passivation rakaumbwa harisi nyore kuratidzwa kumhepo ine hunyoro, zvichiwedzera zvakanyanya kugona kwayo kurwisa ngura. Kune zvikamu zvechitubu, zvikamu zvakatetepa (ukobvu hwemadziro <0.5m), uye zvikamu zvesimbi zvinoda simba rakawanda remakanika, kubviswa kwehydrogen kunofanirwa kuitwa, nepo zvikamu zve copper ne copper alloy zvingasade kubviswa kwehydrogen.
Kugadzira simbi nemagetsi (galvanizing) kune mutengo wakaderera, kuri nyore kugadzira, uye mhedzisiro yakanaka. Simba rezinc harina kunaka, saka zinc coating imhando yeanodic coating yesimbi dzakawanda.
Galvanization inoshandiswa zvakanyanya mumamiriro ekunze uye mune dzimwe nzvimbo dzakanaka. Asi haina kukodzera kushandiswa sechinhu chinokwesha.
Cpurasitiki yehhm
Hunhu: Kune zvikamu zvinosangana nemhepo yegungwa kana mvura yegungwa, uye mumvura inopisa pamusoro pe70℃, cadmium plating yakagadzikana, inodzivirira ngura zvakanyanya, inonyorovesa zvakanaka, uye inonyunguduka zvishoma nezvishoma muhydrochloric acid yakasanganiswa, asi inonyunguduka zvakanyanya mu nitric acid uye hainyungudike mu alkali. Oxyde yayo hainyungudikewo mumvura. Cadmium coating yakapfava kupfuura zinc coating, ine hydrogen embrittle shoma uye inonamatira zvakasimba.
Uyezve, pasi pemamwe mamiriro emagetsi, cadmium coating inowanikwa inonakidza zvikuru kupfuura zinc coating. Asi gasi rinogadzirwa necadmium panguva yekunyunguduka rine chepfu, uye soluble cadmium salts dzine chepfuwo. Pasi pemamiriro ezvinhu akajairwa, cadmium inoshanda secathodic coating pasimbi uye seanodic coating mumhepo yegungwa nekupisa kwakanyanya.
Inonyanya kushandiswa kudzivirira zvikamu kubva mukuora kwemhepo kunokonzerwa nemvura yegungwa kana mimwe mvura yemunyu yakafanana, pamwe chete neutsi hwemvura yegungwa yakasviba. Zvikamu zvakawanda muindasitiri yendege, yegungwa, uye yemagetsi, masipiringi, uye zvikamu zvine shinda zvakaputirwa ne cadmium. Inogona kupukutwa, kusanganiswa ne phosphate, uye kushandiswa senzvimbo yekupenda, asi haigone kushandiswa semudziyo.
Kuputira Chromium
hunhu:
Chromium inogara yakasimba mumhepo ine hunyoro, alkaline, nitric acid, sulfide, carbonate solutions, uye organic acids, uye inonyungudika nyore nyore mu hydrochloric acid uye hot concentrated sulfuric acid. Pasi pesimba re direct current, kana chromium layer ikashanda se anode, inonyungudika nyore nyore mu caustic soda solution.
Chigadziko chechromium chine kunamatira kwakasimba, kuomarara kwakanyanya, 800-1000V, chinodzivirira kupera zvakanaka, chiedza chakasimba, uye chinodzivirira kupisa zvakanyanya. Hachichinji ruvara rwuri pasi pe480℃inotanga kuoxidation pamusoro pe500℃, uye inoderedza kuomarara zvakanyanya pa700℃Dambudziko rayo nderekuti chromium yakaoma, inopfava, uye inokurumidza kutsemuka, kunyanya kana ikasangana nezvinhu zvinokanganisa zvakasiyana-siyana. Uye ine maburi.
Simbi yeChromium inowanzoita kuti ipfuure mumhepo, zvichikonzera kuumbwa kwefirimu repasi uye nokudaro zvichichinja kugona kwechromium. Nokudaro, chromium inova cathodic coating pasimbi.
Hazvina kunaka kuisa jira re chrome rakanangana sechikamu chekudzivirira ngura pamusoro pezvikamu zvesimbi. Kazhinji, jira re electroplating rine ma layer akawanda (kureva jira remhangura).→nickel plating→chromium plating) inodiwa kuti ngura iite basa rayo
kudzivirira nekushongedza. Parizvino inoshandiswa zvakanyanya mukuvandudza kusakara kwezvikamu, kugadzirisa saizi, kuratidzwa kwechiedza, uye mwenje wekushongedza.
Kuputira nickel
hunhu:
Nickel ine kugadzikana kwakanaka kwemakemikari mumhepo uye ine alkaline solution, haichinji ruvara nyore, uye inongopiswa chete patembiricha dzinopfuura 600° C. Inonyungudika zvishoma nezvishoma musulfuric acid nehydrochloric acid, asi inonyungudika nyore nyore mu nitric acid yakanyungudika. Inonyungudika nyore nyore mu nitric acid yakasanganiswa uye nekudaro inodzivirira ngura zvakanaka.
Kuisa nickel plating kwakaomarara, kuri nyore kupolisha, kune chiedza chakawanda, uye kunogona kuwedzera runako. Dambudziko rayo nderekuti ine maburi madiki. Kuti ikunde dambudziko iri, machira esimbi ane layer yakawanda anogona kushandiswa, nickel iri pakati nepakati.
Nickel ipurasitiki inoputira simbi uye purasitiki inoputira simbi.
Inowanzoshandiswa kuchengetedza machira ekushongedza kudzivirira ngura uye kuwedzera runako. Kuisa nickel pazvigadzirwa zvemhangura kwakanakira kudzivirira ngura, asi nekuda kwekukosha kwenickel, copper tin alloys dzinowanzo shandiswa pachinzvimbo chenickel plating.
Nguva yekutumira: Mbudzi-14-2024
