Q500Nh huab cua tiv thaiv nyob rau hauv cov chaw sib txawv
Q500Nh, lub zog loj dua qub hlau (EN 10025-5), ua ib qho acidic tsis zoo rau cov acidic / alkaline ib puag ncig (ph5–9), tab sis nws cov kev ua tau zoo nyob rau hauv ntau qhov kev mob:
Acidic (Ph<4):
Ua kom nrawm corrosion vim h⁺ ion tawm tsam ntawm lub twina.
Piv txwv li: Cov Cheeb Tsam muaj nrog rau cov pa phem (pH ~ 3) yuav xav kom muaj tsho tiv no.
Alkaline (pH >10):
Passive txheej destabilization, tshwj xeeb yog nrog chloride 共存 (piv txwv li, ntug hiav txwv.
Qhov tseem ceeb:
Alloy Tsim: Cu, CR, thiab Ni txhim kho Patina Ruaj rau hauv pH 6-8.
Tseem ceeb pib: Nruam Ph<4 or >10 xav tau kev tiv thaiv kev tiv thaiv (piv txwv li, pleev xim lossis kev tiv thaiv Cathodic).
Cov ntaub ntawv siv:
Kev Poob: <0.05 mm/year in rural (pH ~6) vs. 0.1–0.3 mm/year in industrial/coastal zones.
Lus teb: Rau phustres, ua ke q500nh nrogZinc-nplua nujlossisInhibit noo noo.
