Nghiên cứu khả năng ức chế ăn mòn thép trong dung dịch Nacl 0,1 M của Clay hữu cơ nanofil5

Corrosion inhibition of organic clay nanofil5 in NaCl 0.1 M solution was studied by polarization curves and electrochemical impedance spectroscopy. The clay concentrations studied were between 1 g/l and 5 g/l. The clay nanofil5 plays both anodic and cathodic corrosion inhibition. The corrosion inhibition of clay nanofil5 depends on the concentration. The results obtained by two methods were in good agreement and showed that the highest inhibition efficiency was obtained with the nanofil5 concentration of 3 g/l. The influence of the immersiontime on the inhibition efficiency was also studied. The results indicated that at the first 120 minutes of immersion the inhibition efficiency increased rapidly, which was about 79.6%. Then the inhibition efficiency did not changed very much with immersion time, after 240 minutes of immersion the inhibition efficiency was 81.4%. Surface anlyse by SEM indicated the presence of clay platelets on steel surface after immersion in NaCl 0.1 M solution containing 3 g/l nanofil5.
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Nghiên cứu khả năng ức chế ăn mòn thép trong dung dịch Nacl 0,1 M của Clay hữu cơ nanofil5T¹p chÝ Hãa häc, T. 44 (6), Tr. 739 - 744, 2006 NGHI£N CøU KH¶ N¡NG øC CHÕ ¡N MßN THÐP TRONG DUNG DÞCH NaCl 0,1 M CñA CLAY H÷U C¥ NANOFIL5 §Õn Tßa so¹n 16-2-2006 T« ThÞ Xu©n H»ng1, NguyÔn ThÞ ThÕ Loan2, Ph¹m Gia Vò1, TrÞnh Anh Tróc1 1 ViÖn kü thuËt NhiÖt ®íi, ViÖn Khoa häc v- C«ng nghÖ ViÖt Nam 2 Tr2êng §¹i häc khoa häc tù nhiªn, Th-nh phè Hå ChÝ Minh Summary Corrosion inhibition of organic clay nanofil5 in NaCl 0.1 M solution was studied by polarization curves and electrochemical impedance spectroscopy. The clay concentrations studied were between 1 g/l and 5 g/l. The clay nanofil5 plays both anodic and cathodic corrosion inhibition. The corrosion inhibition of clay nanofil5 depends on the concentration. The results obtained by two methods were in good agreement and showed that the highest inhibition efficiency was obtained with the nanofil5 concentration of 3 g/l. The influence of the immersion time on the inhibition efficiency was also studied. The results indicated that at the first 120 minutes of immersion the inhibition efficiency increased rapidly, which was about 79.6%. Then the inhibition efficiency did not changed very much with immersion time, after 240 minutes of immersion the inhibition efficiency was 81.4%. Surface anlyse by SEM indicated the presence of clay platelets on steel surface after immersion in NaCl 0.1 M solution containing 3 g/l nanofil5. I - Më §ÇU n¨ng øc chÕ ¨n mßn ® îc ®¸nh gi¸ b»ng ®o ® êng cong ph©n cùc v tæng trë ®iÖn hãa. BÒ § tõ l©u clay d¹ng bentonit ® ® îc sö mÆt thÐp sau khi ng©m trong dung dÞch NaCldông l m bét ®én còng nh phô gia trong 0,1 M víi 3 g/l nanofil5 ® îc ph©n tÝch b»ngpolyme v líp phñ. Trong nh÷ng n¨m gÇn ®©y kÝnh hiÓn vi ®iÖn tö quÐt.c«ng nghÖ nano ® t¹o ra c¸c lo¹i vËt liÖunanocompozit víi c¸c tÝnh n¨ng kü thuËt næi II - tHùC NGHIÖMtréi m vËt liÖu th«ng th êng kh«ng cã [1 - 4].Clay h÷u c¬ ® îc sö dông ng y c ng nhiÒu 1. Nguyªn liÖutrong c¸c vËt liÖu nanocomopozit, ®Æc biÖt trong - Clay h÷u c¬, nanofil5 do h ng SUDlíp phñ nanocompozit [5 - 9]. ChØ víi nång ®é CHIME cung cÊp l lo¹i clay ® îc h÷u c¬ hãananoclay h÷u c¬ rÊt nhá ® t¨ng kh¶ n¨ng b¶o b»ng ammonium cã m¹ch cacbuahydro C18.vÖ cña m ng s¬n lªn rÊt nhiÒu. NhiÒu c«ng tr×nh - Kim lo¹i nghiªn cøu l thÐp cacbon XC 35c«ng bè cho thÊy pigment trao ®æi ion trªn c¬ chøa c¸c nguyªn tè ngo i s¾t nh sau: C: 0,35së clay bentonit cã kh¶ n¨ng øc chÕ ¨n mßn cao %; Mn: 0,65 %; Si: 0,25 %; P, S < 0,035 %.cã thÓ thay thÕ cromat l pigment cã hiÖu qu¶b¶o vÖ cao nh ng ®éc h¹i. 2. §o ®iÖn hãa B i b¸o n y tr×nh b y mét sè kÕt qu¶ nghiªn S¬ ®å ®o ®iÖn hãa l hÖ 3 ®iÖn cùc ® îc nèicøu kh¶ n¨ng øc chÕ ¨n mßn thÐp cña clay h÷u víi m¸y AUTOLAB P30. §iÖn cùc l m viÖc lc¬ nanofil5 trong dung dÞch NaCl 0,1 M. Kh¶ mÉu thÐp cã bäc gen v diÖn tÝch mÆt c¾t tiÕp 739xóc víi dung dÞch ®iÖn li l 1 cm2, ®iÖn cùc so tr×nh b y ® êng cong ph©n cùc cña ®iÖn cùcs¸nh l ®iÖn cùc calomen b o ho , ®iÖn cùc ®èi thÐp sau 60 phót ng©m trong dông dÞch NaCl 0,1l ®iÖn cùc platin. BÒ mÆt ®iÖn cùc l m viÖc M víi c¸c nång ®é nanofil5 kh¸c nhau. Tõ® îc m i b»ng giÊy gi¸p c¸c bua silic ®Õn ®é ® êng cong ph©n cùc c¸c gÝa trÞ thÕ ¨n mßn, mËtmÞn 1200, sau ®ã l m s¹ch b»ng etanol, n íc cÊt ®é dßng ¨n mßn v hiÖu suÊt øc chÕ ¨n mßnv sÊy kh«. §iÖn cùc tiÕp ®ã ® îc ng©m trong ® îc x¸c ®Þnh v tr×nh b y trong b¶ng 1.dung dÞch NaCl 0,1 M cã mÆt nanofil5 tr íc khi®o ®iÖn ho¸. Tæng trë ®iÖn hãa ® îc ®o trong B¶ng 1: C¸c gi¸ trÞ thÕ ¨n mßn, mËt ®é dßng ¨nkho¶ng tÇn sè tõ 100 kHz ®Õn 6 mHz víi chÕ ®é mßn v hiÖu suÊt øc chÕ ¨n mßn thÐp trong dungquÐt tù ®éng. dÞch NaCl 0,1 M cña nanofil5 ë c¸c nång ®é kh¸c nhau3, Ph©n tÝch bÒ mÆt BÒ mÆt mÉu thÐp sau khi ng©m trong dung HiÖu Nång ®é Icorr,dÞch NaCl 0,1 M cã chøa nanofil5 ® îc quan s¸t ...