Galvanizing
Hunhu:
Zinc yakagadzikana mumhepo yakaoma uye haina kuchena nyore nyore. Munzvimbo dzemvura uye dzine hunyoro, inopindirana neokisijeni kana kabhoni dhaikisaidhi kuumba oxide kana alkaline zinc carbonate mafirimu, izvo zvinogona kudzivirira zinc kuti irambe ichiwedzera oxidize uye inopa dziviriro.
Zinc inonyanya kukanganiswa nekuora mu acids, alkalis, uye sulfides. Iyo galvanized layer inowanzoda kurapwa passivation. Mushure mekupfuura mu chromic acid kana chromate mhinduro, iyo yakaumbwa passivation firimu haisi nyore kuoneswa kumhepo ine hunyoro, ichiwedzera zvakanyanya kugona kwayo kwekurwisa-corrosion. Kune zvikamu zvechitubu, zvikamu zvakatetepa-madziro (madziro ukobvu <0.5m), uye zvikamu zvesimbi zvinoda simba remagetsi, kubviswa kwehydrogen kunofanira kuitwa, nepo mhangura nemhangura alloy zvikamu zvingasada kubviswa kwehydrogen.
Galvanizing ine mutengo wakaderera, nyore kugadzirisa, uye mhedzisiro yakanaka. Iyo yakajairwa mukana we zinc haina kunaka, saka zinc coating ndeye anodic coating kune akawanda masimbi.
Galvanization inoshandiswa zvakanyanya mumamiriro ekunze uye dzimwe nzvimbo dzakanaka. Asi haina kukodzera kushandiswa sechikamu chekukwesha.
Chrome plating
Hunhu: Kune zvikamu zvinosangana nemhepo yegungwa kana mvura yegungwa, uye mumvura inopisa pamusoro pe70.℃, cadmium plating haina kugadzikana, ine corrosion resistance yakasimba, mafuta anozora zvakanaka, uye anonyungudika zvishoma nezvishoma mu dilute hydrochloric acid, asi inonyungudika zvakanyanya munitric acid uye isinganyunguriki mualkali. Okisijeni yaro zvakare haigone kunyungudika mumvura. Cadmium coating yakapfava kupfuura zinc coating, ine shoma hydrogen embrittlement uye yakasimba adhesion.
Zvakare, pasi pemamwe mamiriro e electrolytic, iyo cadmium coating inowanikwa inonyanya kufadza kupfuura zinc coating. Asi gasi rinogadzirwa necadmium panguva yekunyunguduka rine muchetura, uye soluble cadmium salt ine chepfu zvakare. Mumamiriro ezvinhu akajairwa, cadmium inoshanda secathodic coating pasimbi uye seanodic coating mumhepo yegungwa uye yakanyanya-tembiricha.
Inonyanya kushandiswa kuchengetedza zvikamu kubva mukuora kwemuchadenga kunokonzerwa nemvura yegungwa kana yakafanana munyu mhinduro, pamwe chete nemhepo yakazara yegungwa. Zvikamu zvakawanda mumaindasitiri endege, emugungwa, uye emagetsi, zvitubu, uye zvikamu zvine shinda zvakaputirwa necadmium. Inogona kukwenenzverwa, phosphated, uye kushandiswa sechigadziko chepende, asi haigone kushandiswa semudziyo.
Chromium plating
maitiro:
Chromium yakagadzikana zvakanyanya mumhepo ine hunyoro, alkaline, nitric acid, sulfide, carbonate solutions, uye organic acids, uye inonyungudika nyore nyore muhydrochloric acid uye inopisa concentrated sulfuric acid. Pasi pekuita kwekunanga ikozvino, kana chromium layer ichishanda seanode, inonyungudika nyore nyore mu caustic soda solution.
Iyo chromium layer ine yakasimba adhesion, yakanyanya kuoma, 800-1000V, yakanaka kupfeka kuramba, kupenya kwakasimba kwechiedza, uye kupisa kwakanyanya. Haisi kuchinja ruvara pasi pe480℃, inotanga kuita oxidize pamusoro pe500℃, uye inoderedza zvakanyanya kuoma pa700℃. Chakashata chayo ndechekuti chromium yakaoma, ine brittle, uye inoda kudhindwa, kunyanya kana ichiiswa pasi pekuchinjana mitoro. Uye ine porosity.
Chromium metal inowanzoita passivation mumhepo, zvichiita kuti pave nekuumbwa kwefirimu yekufambisa uye nokudaro kuchinja kukwanisa kwechromium. Naizvozvo, chromium inova cathodic coating pane iron.
Izvo hazvina kunaka kuisa yakananga chrome plating senge anti-corrosion layer pamusoro pezvikamu zvesimbi. Kazhinji, multi-layer electroplating (kureva copper plating→nickel plating→chromium plating) inodiwa kuti uwane chinangwa che ngura
kudzivirira nekushongedza. Parizvino inoshandiswa zvakanyanya mukuvandudza kupfeka kuramba kwezvikamu, kugadzirisa zviyero, kupenya kwechiedza, uye mwenje wekushongedza.
Nickel plating
maitiro:
Nickel ine kugadzikana kwakanaka kwemakemikari mumhepo uye alkaline solution, haisi nyore kushanduka, uye inongoiswa oxidized patembiricha inopfuura 600.° C. Inonyungudika zvishoma nezvishoma mu sulfuric acid uye hydrochloric acid, asi inonyungudika nyore mu dilute nitric acid. Inopfuudzwa zviri nyore muconcentrated nitric acid uye saka ine yakanaka corrosion resistance.
Nickel plating ine kuoma kwepamusoro, iri nyore kupurisa, ine chiedza chepamusoro, uye inogona kuwedzera aesthetics. Kukanganisa kwayo ndeyekuti ine porosity. Kuti ukunde kukanganisa uku, machira esimbi akawanda anogona kushandiswa, ane nickel seyepakati layer.
Nickel ndeye cathodic coating yesimbi uye anodic coating yemhangura.
Inowanzoshandiswa kuchengetedza machira ekushongedza kuitira kudzivirira kuora uye kuwedzera aesthetic kukwezva. Nickel plating pazvigadzirwa zvemhangura yakanakira kudzivirira ngura, asi nekuda kwekukosha kwenickel, copper tin alloys inowanzoshandiswa pachinzvimbo chenickel plating.
Nguva yekutumira: Nov-14-2024
