Ntsev tshuaj tsuag corrosion kuaj chamberyog ib qho kev xeem ib puag ncig uas feem ntau yog siv dag simulated ntsev tsuag ib puag ncig tsim los ntawmntsev tsuag tshuaj ntsuam cov cuab yeejlos ntsuas qhov corrosion kuj ntawm cov khoom lossis cov ntaub ntawv hlau.
Siv dav hauv aerospace, aviation, nkoj, kho vajtse thiab hluav taws xob, khoom siv hluav taws xob, tshuaj, xa ntawv thiab kev sib txuas lus, tsheb thiab maus taus, kev lag luam thiab kev lag luam mining. Kev tshuaj xyuas zoo thiab lwm lub tuam tsev thiab kev lag luam. Nws kuj tuaj yeem siv rau hauv kev kho cua sov thiab kev lag luam saum npoo. Piv txwv li, QPQ cov txheej txheem cov phiaj xwm yuav xav tau kev sim haus luam yeeb, yog li kev kho cua sov thiab kev kho saum npoo yuav raug siv, thiab cov chaw tsim hluav taws xob kuj tseem siv tau.
Neutral ntsev tsuag test (NSS test)
The neutral salt spray test is an artificially accelerated corrosive test. Used to test the corrosion resistance of protective coatings (such as zinc layers, cadmium layers) and protective decorative coatings (nickel-chromium coatings, etc.). It uses 5% sodium chloride aqueous solution with a pH value of 6.5~7.2. The relative humidity of the salt water is >95%. 24h yog lub voj voog. Yog xav paub meej, thov xa mus rau GB/T 6461--2002 tus qauv hauv tebchaws.
Tus nqi pH ntawm kev sim tshuaj yuav tsum tau hloov kho kom pH tus nqi ntawm cov tshuaj tsuag uas sau rau hauv lub thawv ntsev yog nyob nruab nrab ntawm 6.5 thiab 7.2. Tus nqi pH yuav tsum ntsuas nrog acidimeter ntawm 25 degree ± 2 degree. Precision pH daim ntawv xeem nrog qhov ntsuas qhov tseeb tsis pub ntau tshaj 0.3 tuaj yeem siv rau kev ntsuas txhua hnub. Thaum tawm ntawm qhov ntau, tshuaj ntsuam qib hydrochloric acid, sodium hydroxide lossis sodium bicarbonate tuaj yeem ntxiv rau kev hloov kho.
Kev poob ntawm carbon dioxide los ntawm cov tshuaj thaum lub sij hawm txau yuav ua rau pH hloov. Cov kev ntsuas sib xws yuav tsum tau ua, piv txwv li, cua sov cov tshuaj kom dhau 35 degree ua ntej pub rau hauv cov twj paj nruag lossis npaj cov tshuaj nrog cov dej kub npau npau tshiab kom txo cov pa roj carbon dioxide hauv cov tshuaj thiab zam kev hloov pauv ntawm pH nqi.
Neutral ntsev tsuag tshuaj ntsuam yog tsim rau:
-- Hlau thiab lawv cov alloys;
--Cov txheej txheem hlau (anodic lossis cathodic);
--Kev hloov pauv txheej;
--Anodic oxidation zaj duab xis;
--Organic txheej ntawm hlau substrate.
Q-fog CRH ntsev tsuag tshuaj ntsuam chamber tuaj yeem siv los ua qhov ntsuas nruab nrab ntsev tsuag, tshuaj acetic ntsev thiab CASS ntsev tsuag tshuaj ntsuam
Q-fog CRH ntsev tsuag tshuaj ntsuam chamber tuaj yeem siv los ua qhov ntsuas nruab nrab ntsev tsuag, tshuaj acetic ntsev thiab CASS ntsev tsuag tshuaj ntsuam
Acetic acid ntsev tsuag test (AASS test)
Ntxiv qhov tsim nyog ntawm glacial acetic acid rau cov ntsev npaj los xyuas kom meej tias pH tus nqi ntawm cov kua sau hauv lub thawv ntsev yog 3.1 txog 3.3. Yog tias tus nqi pH ntawm cov tshuaj npaj pib yog 3. Tus nqi pH yuav tsum ntsuas nrog acidimeter ntawm 25 degree ± 2 degree. Precision pH daim ntawv xeem nrog qhov ntsuas qhov tseeb tsis pub ntau tshaj 0.1 tuaj yeem siv rau kev ntsuas txhua hnub. Tus nqi pH ntawm cov tshuaj tuaj yeem hloov kho nrog glacial acetic acid lossis sodium hydroxide.
Kev kuaj tshuaj ntsev acetic yog tsim rau tooj liab + npib tsib xee + chromium los yog npib tsib xee + chromium hniav txheej, thiab kuj yog tsim rau aluminium anodized films.
Copper Accelerated Acetic Salt Spray Test (CASS Test)
Hauv cov kua ntsev npaj, ntxiv tooj liab chloride (CuCl2·2H2O) nrog ib qho concentration ntawm 0.26 g/L±{5}}.02 g/L (ie 0 205g / L ± 0.015 g / L anhydrous tooj liab chloride). Txoj kev hloov pH tus nqi ntawm cov tshuaj yog tib yam li 3.2.3.
Cov tooj liab nrawm acetate ntsev tsuag tshuaj ntsuam yog tsim rau tooj liab + npib tsib xee + chromium los yog npib tsib xee + chromium hniav txheej, thiab kuj haum rau txhuas anodized films.
Test method Neutral salt spray test (NSS) Acetic salt spray test (AASS) Copper accelerated acetic acid ntsev spray test (CASS)
35 ° ± 2 ° 35 ° ± 2 ° 50 ° ± 2 °
Qhov nruab nrab sedimentation tus nqi ntawm ib cheeb tsam kab rov tav ntawm 80cm2 yog 1.5mL/h ± 0.5mL/h
Qhov concentration ntawm sodium chloride tov (sau tov) yog 50g / L ± 5g / L
PH tus nqi 6.5 ~ 7.23.1 ~ 3.33.1 ~ 3.3
Kev sib piv ntawm peb txoj kev sim hauv tus qauv "GB/T 10125-2012 Artificial Atmosphere Corrosion Test Salt Spray Test"
CASS test yog cov ntawv luv ntawm tooj liab nrawm acetate test. Nws yog siv los kuaj qhov corrosion kuj ntawm tooj liab-nickel-chromium composite txheej thiab nickel-chromium txheej. Cov txiaj ntsig tau zoo sib xws nrog cov txiaj ntsig ntawm atmospheric exposure thwmsim. Nws yog ntxiv 0.26g/L cuprous chloride rau 5% sodium chloride aqueous tov, thiab siv glacial acetic acid los kho tus nqi pH=3.2±0.1. Cov kua qaub no yog txau rau ntawm qhov chaw plated. Lwm yam kev mob thiab txoj kev yog tib yam li Qhov nruab nrab ntsev tshuaj tsuag txoj kev yog tib yam. Tag nrho cov reagents siv yog tshuaj dawb huv qib reagents.
Qhov kev kuaj mob no hnyav dua li qhov nruab nrab ntsev tsuag tshuaj ntsuam mob. Feem ntau yog siv rau kev ntsuam xyuas corrosion kuj ntawm nickel composite coatings.