Taw qhia rau Tantalum

Tantalum muaj corrosion kuj zoo heev nyob rau hauv feem ntau inorganic acids, zoo ib yam li iav, thiab muaj ib qho tseem ceeb siv nyob rau hauv cov tshuaj kev lag luam, ntxiv rau hydrofluoric acid, fluorine, fuming sulfuric acid thiab alkali, yuav luag resistant rau corrosion ntawm tag nrho cov chemical media (xws li. Boiling point hydrochloric acid, nitric acid thiab sulfuric acid hauv qab 175 degree).

Tantalum has excellent corrosion resistance to dilute sulfuric acid below 75% and can be used at any temperature; it can be used for concentrated sulfuric acid without gas at 160~170℃; it can be used for concentrated sulfuric acid with gas at 250~260℃, and corrosion increases beyond this temperature. Generally in the high temperature above 170 ℃ to be used before the first test study. Tantalum corrosion resistance to phosphoric acid is also good, but acid such as containing traces of fluorine (>4ppm), tus nqi corrosion nce.

Tantalum feem ntau tsis tiv taus corrosion nyob rau hauv alkali, nws ua nkig thiab corrodes sai dua ntawm qhov kub thiab txias.

Tantalum tuaj yeem cuam tshuam nrog cov roj kub kub (tshwj tsis yog cov roj inert), O2, N2, H2, thiab lwm yam tuaj yeem nkag mus rau sab hauv kom nws nkig, xws li kev sib cuag nrog thawj lub xeev H, tseem yuav nqus cov hydrogen thiab ua nkig. Yog li, cov khoom siv tantalum yuav tsum tsis txhob sib cuag nrog cov hlau nquag (xws li Fe, Al, Zn), vim tias nws yooj yim los tsim cov tantalum - hlau (Al, Zn) thawj lub xov tooj ntawm tes, cov hydrogen tsim los ntawm thawj cov tshuaj tiv thaiv ntawm tes yuav ua kom puas. tantalum cathode thiab ua rau cov cuab yeej ua tsis tiav. Yog hais tias ib qho me me ntawm platinum (thaj tsam ntawm ib kaum txhiab ntawm tantalum) nrog ib qho me me hydrogen overvoltage txuas nrog tantalum, ces tag nrho cov hydrogen yuav raug tso tawm ntawm platinum, uas tuaj yeem zam kev puas tsuaj ntawm tantalum los ntawm hydrogen.

Tantalum zoo heev corrosion kuj, tab sis kim, yog li nws daim ntawv thov yog tsuas yog cov vaj huam sib luag thiab linings, thiab thiaj li yuav txo tau cov nqi, tantalum txheej thickness cia siab li nyias li sai tau, yog li composite panels los yog linings vuam yog nyuaj heev, vim tantalum thiab steel melting. point sib txawv, (tantalum melting point ntawm 2996 degree C, lub melting point ntawm cov hlau rau lub 1400 degree C) thiab Fe thiab Ta ntawm qhov kub thiab txias yuav tsim ib nkig Fe2Ta Intermetallic tebchaw, yog hais tias cov kev ntsuas tsis tsim nyog, nws yog ib qho yooj yim mus use. ua rau weld tawg.

In the welding of thin-layer tantalum steel composite plate or lining, the thickness of the compound layer has an important effect on its weldability, Figure 1 is a schematic diagram of Ta1/16MnR composite plate welding, the smaller the thickness of the compound layer h, the higher the temperature T on the composite interface. When T>1500 degree, ib cheeb tsam melting ntawm 16MnR ntawm lub interface yuav tshwm sim. Thiab Fe thiab Ta ntawm 1460 degree yuav tshwm sim eutectic cov tshuaj tiv thaiv, ua rau Fe2Ta brittle intermetallic tebchaw, nyob rau hauv qhov kev txiav txim ntawm vuam kev nyuaj siab, nws yog ib qho yooj yim rau tawg thiab tantalum ntawm lub interface nyob rau sab ntawm lub tantalum weld pas dej ua ke kev taw qhia yuav raug ncua, thaum. hnyav, nws yuav tsim cov kab nrib pleb, lub hauv paus txheej ntawm cov hlau melted yuav dhau los ntawm cov kab nrib pleb nkag mus rau lub diffusion ntawm tantalum weld pas dej ua ke, thiab tantalum reacted nrog cov tiam ntawm Fe2Ta Brittle tebchaw, kom cov weld tawg.
Txhawm rau tiv thaiv qhov tshwm sim no yog qhov tseem ceeb tshaj plaws yog txhawm rau ua kom lub thickness ntawm cov txheej txheej tsim nyog los yog lwm yam kev ntsuas los txo qhov kub ntawm qhov sib cuam tshuam, xws li hauv kev sib tshuam ntawm cov khoom ua ntej sib xyaw ua ke sab nraum ib txheej ntawm lwm cov thermal conductivity ceev ntawm lub hlau, nyob rau hauv thiaj li yuav weld lub tshav kub generated rau ib puag ncig migration. Nyob rau ntawm lub thickness ntawm lub compound txheej thiab kev sib raug zoo ntawm lub weldability ntawm composite phaj, tom qab ib tug loj tus naj npawb ntawm kev ntsuam xyuas, koj muaj peev xwm tsim ib tug qauv ntawm kev sib raug zoo ntawm lub interface kub Ts thiab lub thickness ntawm lub compound txheej h.
When h≤2.0mm, the interface steel melts, iron diffuses into the weld, and cracks appear in the weld. When h>2. Feem ntau, lub thickness ntawm txheej txheej yog 2.5 ~ 4.0 hli. Thaum siv li hauv ob sab phlu, 0.3 ~ 0.5mm yuav siv tau.