Cov ntaub ntawv dab tsi yuav tsum siv rau cov raj xa dej tseem ceeb ntawm cov kua ammonia chaw thau khoom caj npab kom ntseeg tau corrosion tsis kam?
Kua Ammonia (anhydrous ammonia) yog qhov tsis ruaj khov, tab sis nws tuaj yeem tsim almaline daws (thiab nws tuaj yeem ua cov dej noo, ua rau muaj kev xeb, ua rau mob corrosion rau qee cov hlau. Tsis tas li ntawd, trace impurities nyob rau hauv kua ammonia (piv txwv li, hydrogen sulfide, cov pa) yuav ua rau muaj kev xeb nrawm. Yog li, cov twj xa hluav taws xob tseem ceeb yuav tsum tiv thaiv corrosion los ntawm kua ammonia nws tus kheej thiab muaj peev xwm corrosive byproducts. Cov ntaub ntawv tsim nyog suav nrog:
Stainless hlau
304 Stainless hlau: Haum rau kua ammonia nrog lw noo noo, raws li nws chromium-nickel alloy tiv taus qaug zog alkaline corrosion. Kev pheej hmoo ntawm intergranular corrosion nyob rau hauv high-confortration ammonia dej yuav tsum tau sau tseg.
316 Stainless hlau: zoo dua rau 304 vim yog Molybdenum cov ntsiab lus, muab zoo dua rau pitting thiab crevice corrosion, tshwj xeeb tshaj yog hauv cov kua ammonia muaj cov txiv neej impourities.
Tsawg-alloy steel
Xws li, Q345R (yav tas los 16mnr): muaj cov pa roj carbon steel hauv cov kua dej qhuav ammonia tab sis nrog cov raj ntsuas siab dua, haum rau kev kub siab rau siab.
Aluminium thiab Aluminium Alloys
Ntshiab txhuas lossis xeb-pov thawj txhuas (piv txwv li, 3A21): ruaj khov hauv cov kua dej qhuav ammonia nrog tus nqi qis. Lub teeb yuag thiab raug nqi - ua tau zoo tab sis txwv rau nruab nrab-qis nias vim muaj lub zog qis. Zam kev sib cuag nrog noo noo kom tiv thaiv Aluminium hydroxide corrosion.
Cov ntaub ntawv tsis yog xim hlau
PTFE (polytetrafluoroethylene): muaj kev tiv thaiv corrosion-resistant, siv los ua cov kav dej los ntawm cov khoom siv ntub dej los ntawm cov hlau nplaum, xav tau ntawm cov hlau ua haujlwm rau cov qauv kev txhawb nqa.
Frp (fiberglass-fearned yas): tiv taus rau alkalinity, lub teeb yuag, thiab tiv thaiv cov kav dej qis tab sis tsis yog rau kev cuam tshuam kub lossis hnyav.
