Đánh giá khả năng ức chế ăn mòn thép CT3 bằng dịch chiết lá cây thuốc lá trong môi trường HCl 1 M

T. 49(4) 494-498 THANG8NAM2011<br /> TAP CHI HOA HOC<br /> <br /> <br /> <br /> <br /> OANH GIA K H A N A N G UC CH^ AN MON THEP CT3<br /> BANG DjCH CHI^T LA C A Y T H U 6 C LA TRONG MOI TRl/aNG HCI 1 M<br /> Truomg Thj Thao', Nguyen Thj Thanh Hoa', Vu Thj Thu Ha^ Le Quoc Hung^<br /> ''Trudng Dgi hgc Khoa hgc, Dgi hgc Thdi Nguyen<br /> ^Vi('n LLda hgc, Vi(m Khoa hgc vd Cdng ngh^ Vi?t nam<br /> Den Tda soan 29-6-2011<br /> <br /> <br /> Abstract<br /> Extracts from Thai Nguyen Tobacco were prepared by extracting dried leave powder using distilled water.<br /> Corrosion inhibition efficiency of CT3 steel was tested in HCI 1 M solution with and without Thai Nguyen tobacco<br /> extracts 2 g/1 at different immersion time. The obtained results of electrochemical measurements showed that the<br /> corrosion rate of CT3 steel in studied solution decreased 74% after 5 hours of immersion. EIS characterization and<br /> morphological characterization (SEM) of the surface of CT3 steel indicated the information of an inhibitor film on the<br /> sample surface. There is an excellent agreement between methods used for corrosion study in this research.<br /> Keywords: Corrosion inhibitor. Thai Nguyen tobacco extract.<br /> <br /> 1. MO DAU Dong thdi, mgt chit ire che an mdn truyfn thdng la<br /> Urotropin dugc diing d ndng do 7 g/1 df lam doi<br /> An mdn kim loai la mdt van df difn ra hang chiing. Vifc khao sat kha nang uc chf cua cac hgp<br /> ngay khdng ehi d Vift Nam ma d trfn toan thf gidi. chit duge do theo thdi gian tir 1 gid dfn 10 ngay<br /> Nen kinh tf eung da tieu hao khdng nhd cho van de bang mdt sd phuong phap khac nhau.<br /> nay vi ehi phi cho vifc thay the vat lifu bj suy giam<br /> chat lugng, ehi phi cho an toan san xuat, chi phf cho 2. THUC NGHIEM<br /> nghien ciiu chf tgo vat lifu mdi, nghien ciru chdng<br /> an mdn,.... Cd nhifu phuang phap dugc sir dyng df 2.1. Dieu che djch chiet va chuan bj dung djch<br /> bao vf kim logi khdi bj an mdn, trong dd sir dyng thir nghiem<br /> chat ire che la mdt phuang phap hifu hieu va df sir<br /> dung cho cac vat lifu lam vifc trong khdng gian hgn La cay thudc la thu hai vao budi sang tgi La Hifn,<br /> ehe. Rat nhifu nghifn ciru gan day trfn thf gidi dang Vd Nhai, Thai Nguyfn vao thang 10. La rura sach,<br /> tap trung vao vifc tim kiem va thir nghifm eae chat phoi khd rdi xay nhd, ngam trong nude cat tgi nhiet<br /> ire che xanh, than thien mdi trudng [1 3, 7, 10] dp phdng, sau 15 gid dem lgc chiet lan 1, phan ba<br /> nham thay the mdt sd chat lie chf truyen thdng dem ngam tifp 15 gid rdi lgc lan 2, phan ba sau do<br /> nhung cd lien quan dfn van de d nhiem mdi trudng. dugc ngam tifp 15 gid rdi dem lgc. Gom ea 3 phan<br /> Cac nghien ciru eua eiing nhdm tac gia eung da chi djch lgc, dem cd each thuy cbo den khi thu dugc cao<br /> ra kha nang ire che an mdn thep trong eae mdi chiet dae sanh. Cao chiet duge boa tan trong dung<br /> trudng khae nhau ciia djeh chift mdt sd logi cay nhu djeh HCI 1 M vdi ndng do 20 g/1 lam dung djch gdc<br /> ehe, ca phe, thude la, bd ket, dude, di, son trau bang each dgt trong be rung sif u am trong 60 phiit.<br /> [4 - 8].,.. Dung djch nghifn ciru (ndng dp 2 g/1) dugc pha tfr<br /> Tiep tue eac ket qua da edng bd, trong nghifn dung djeh goe bing dung djch nen HCI 1 M.<br /> eiiu nay, chiing tdi trinh bay mdt sd ket qua thu dugc<br /> khi nghien ciru kha nang iirc chf an mdn cho thep 2.2. Chuan bj mau<br /> CT3 (Thai Nguyfn) trong mdi trudmg axit HCI 1 M<br /> khi cd va khdng ed mat djch chiet la eay thude la MIU thep Thai Nguyen cd thanh phin 97,5% Fe;<br /> Thai Nguyfn ndng dp 2 g/1. Djeh chiet thude la lam 0,021%C; 0,652%Si; l,630%Mn; 0,197%<br /> chat ue ehe an mdn kim logi da duge nghien cuu (P^S,Co,Cu,Al,Nb,Sn) duge ehe tgo thanh hai dang<br /> tren the gidi [9]. Mue dich eua bai bao nay la diing mau:<br /> ngudn thudc la dja phuomg de khao sat, khi duge ap Mdt la miu trdn dudng kfnh 1 cm dugc che<br /> dung, day la la ngudn chat lie ehe xanh ddi dao, cd thanh difn cgc lam vifc trong cac phep thu nghifm<br /> thf sir dung d quy md Idn vdi gia thanh hgp ly. dien hoa. C?^ •"*'-- -•" ^-'-^- "-= " r i ^^v rf-'r- --ai<br /> 494<br /> TCHH, T. 49(4), 2011 Vu Thi Thu Hd vd cdng sy<br /> <br /> bing giiy nham tii' thd den mjn, rira sgch, tiy diu quanh khoang the Ur ±25 mV, toe dp quet ImV/s),<br /> md thim udt hoan toan roi lam khd trude khi dgt vao do dudng cong phan cue (khoang the -630 mV den<br /> dung djeh nghifn ciiu. 320 mV, toe dp quet 5 mV/s). Tdng trd dien hoa EIS<br /> Hai la mau vudng 5 cm x 5 em x 0,2 em diing dugc tien hanh tren may PAR START 2273 tai Vien<br /> trong thir nghifm theo phuong phap trgng lugng va Khoa hpc Vat lifu, Vien KH&CN Viet Nam vdi he<br /> phan tich be mat sau thdi gian thii' nghiem. Cac miu ba difn cue nhu do dien hda d tren. Che dp do: thdi<br /> nay dugc tay dau md, tay gi hoa hgc, rira sgch, lam gian dn djnh K) phut, do trong dai tin so 10 kHz dSn<br /> khd, bao quan trong binh hut am 24 gid trude khi 5 niHz va 7 difm/deeade. Ky thuat chup SEM dugc<br /> lam vifc. hanh tren may JEOL 6490 ciia Trung tam Danh gia<br /> Hu hdng Vat lieu, Vien Khoa hpc Vat lieu, Vien<br /> 2.3. Do dac KH&CN Viet Nam.<br /> Cac thir nghifm duge tien hanh theo thdi gian<br /> Thir nghiem trpng lupng gom do chfnh xae kfch ngam mau trong dung dich 1 gid, 5 gid, 1 ngay, 3<br /> thudc mau (tfnh dien tfch S) va xac djnh khoi lugng ng_ay, 6 iTgay, 10 ngay. Mdi phep thir nghiem gdm 3<br /> mau bang can 04 sd trirde thir nghifm (m,). Sau mdt mau va lay ket qua trung binh.<br /> thdi gian thir nghifm (t) mau duge lay ra rira sach,<br /> tay gi hoa hpc, lam khd va bao quan trong binh hut 3. KET QUA vA THAO LUAN<br /> am 24 gid trudc khi can xac djnh khdi lupng miu<br /> cdn lgi sau thdi gian thir nghifm (n\). Toe dp an Tir bang 1 ta thay, theo thdi gian, toe dp an mdn<br /> mdn duge xac djnh theo cdng thire: thep ndi ehung giam dan, tuy nhien trong mdi trudng<br /> m - m , axit HCI IM klii ed mat chat ire che (djch chiet la cay<br /> V = —-—- (g/enr.ngay) thudc la Thai Nguyen (DCTla) hoac Urotropin (U))<br /> cac phep do difn hoa duge thgc hifn tren may thi tde dp an mdn giam di dang kf, hieu suit bao ve<br /> PGS-HH5 chf tgo tgi Vifn Hoa hgc, Vifn KH&CN klia cao, dat >S0%, trong do hieu suat bao ve cua<br /> Vift Nam vdi hf ba dien cue: Dien cue lam viec WE DCTla cao nhat dgt dixgc sau thdi gian ngam 6 ngay.<br /> la difn cgc ehe tgo tir thep CT3, difn cue so sanh Kha nang bao ve thep eua DCTla ndi chung tuomg<br /> Ag/AgCI trong KCl bao hoa, difn cue ddi la thep duong vdi U. Khi cd mat chat ire ehe thi toe dp an<br /> khdng gi cd dien tich Idn. Cae phep do bao gom do mdn ciia thep deu tang khi ngam tir 1 ngay den 3 ngay<br /> difn thf mgeh hd (Ur), do dien trd phan cgc (xung sau dd giam klii ngam den 6 rdi 10 ngay.<br /> <br /> Bdng 1: Tdc dp an mdn thep CT3 trong mdi trudng axit HCI 1 M<br /> khi ed va khdng cd mat chat ire ehe theo thdi gian ngam<br /> Thdi gian 1 ngay 3 ngay 6 ngay 10 ngay<br /> Hieu Hieu Hifu<br /> V,b, Hifu V,b, V,b, V,b,<br /> Mdi trudng suat, suat, suat,<br /> g/em^.ngay suat, %) g/cm^.ngay g/cm^.ngay g/em^.ngay<br /> % % %<br /> HCllM 8,2826x10-^ 7,2471x10-^ 1,0686x10"^ 6,7379x10"^<br /> HCI 1 M+DCTla 2,9154x10-^ 96,48 1,3089x10-^ 81,94 2,3882x10"^ 97,77 3,2344x10-^ 95,20<br /> HC11M+U7g/I 3,5416x10"* 95,72 1,4410x10"^ 80,12 1,6770x10-^ 98,43 1,4458x10"^ 97,85<br /> <br /> Bdng 2: Kft qua thir nghifm an mdn thep CT3 theo phuang phap difn boa trong cac mdi trudng khac nhau<br /> 7 T<br /> <br /> Thdi Hifu suat V (Tafel), Hifu suat<br /> Mdi trudng Ur,V R, Q<br /> gian bao vf, R mm/nam bao vf, V<br /> Ih HCI IM -0,4702 131,9393 1,4393<br /> HCllM + DCTlaTN2g/l -0,4775 438,1498 69,89% 4,8408x10"' 66,37%;<br /> HCI IM +Urotropin 7g/l -0,4935 533,3915 75,26% 3,8843x10-' 75,01%;<br /> 5h HCI IM -0,4723 159,2516 8,9179x10-'<br /> HCI lM + DCTlaTN2g/l -0,4931 621,0272 74,36% 3,5779x10-' 59,88%;<br /> % HCI 1M +Urotropin 7g/l -0,4926 838,5103 81,01% 2,8165x10-' 68,75%<br /> 1 HCI IM -0,4691 530,5432 4,3358x10"'<br /> ngay HCIlM + DCTlaTN2g/l -0,4831 1449,1265 63,39% 1,5580x10-' 64,07%<br /> HCI 1M +Urotropin 7g/I -0,4818 1223,1980 56,63% 1,2714x10"' 70,68%<br /> <br /> 495<br />  TCHH, T. 49(4), 2011 Ddnh gid khd ndng ire che dn mon.<br /> <br /> <br /> Thdi Hifu suit V (Tafel), Hifu suit<br /> Mdi trudmg Ur,V R,n<br /> gian bao vf, R mm/nam bao vf, V<br /> 3 HCI IM -0,4829 391,3152 5,5857x10-'<br /> ngay HCI 1 M + DC Tia TN 2g/l -0,4867 1242,0372 68,49% 2,3341x10"' 58,21%<br /> HCI 1 M + Urotropin 7g/l -0,4901 831,5332 52,94% 2,7327x10-' 51,08%<br /> 6 HCI 1 M -0,5111 352,6091 8,0430x10'<br /> ngay HCI 1 M + DC Tia TN 2g/l -0,5073 840,1017 58,03% 2,9921x10-' 62,80%<br /> HCI 1 M + Urotropin 7g/l -0,5104 1078,2257 67,30% 2,4711x10-' 69,28%<br /> 10 HCI 1 M -0,5222 326,0836 8,8176x10'<br /> ngay HCI 1 M + DC Tia TN 2g/l -0,5182 917,9404 64,48% 3,1720x10-' 64,03%<br /> HCI 1 M + Urotropin 7g/l -0,5230 1203,6972 72,91% 1,8915x10' 78,55%<br /> <br /> <br /> H(R)=\ ^"100(%) H(V) = ^Ji-JML\OQ(o/^)<br /> R,uc N<br /> <br /> <br /> <br /> ~:r:^^ _'_ ^<br /> .___ ^^^-^<br /> . . - • - -<br /> <br /> <br /> <br /> <br /> 't<br /> = * - • - •<br /> <br /> <br /> <br /> <br /> ?<br /> 1 "":<br /> VV -IK-'^<br /> <br /> <br /> . \4<br /> •—1 %-u ..^—<br /> <br /> 3<br /> 1<br /> <br /> \ \<br /> '4<br /> 3 2 )<br /> •0 5 -0 45 -OS -0 45<br /> U(V) U