Khả năng ức chế ăn mòn thép cacbon của nano oxit kẽm biến tính với axit 2-benzothiazolylthio-succinic

TAP CHI HOA HQC

DOL 10.15625/0866-7144.2015-0082

T. 53(1)27-31 THANG 2 NAM 2015

K HA NANG LTC CHt AN MON THEP CACBON CUA NANO OXIT KEM

BIEN TJNH Vai AXIT 2-BENZOTHIAZOLYLTHIO-SUCCINIC

Dang Quyet Th3ng, Trinh Anh True*, Pham Gia Vii, To Thi Xnan H3ng

Vi?n Ky thugt nhiet ddi, Viin Hdn lam Khoa hgc vd Cdng ngh§ Viet Nam

Den Tda sogn 20-6-2014; Chip nhin dang 13-2-2015

Abstract

In this study, ZnO nanoparticle was synthesized and modified by a corrosion inhibitor 2-benzothiazolylthio￾succinic acid (BTSA) for corrosion protection of a carbon steel surface. The TEM, SEM and IR analyses were used for

characterized the synthesized products. The nano ZnO size in the about 20 nm and the IR analyze shows the presence of

BTSA on the ZnO surface. The corrosion inhibition of nano ZnO and nano ZnO bearing BTSA in the NaCI 0.1 M

solution was characterized using electrochemical techniques. In the NaCl 0.1 M, both nano ZnO and nano ZnO-BTSA

have the inhibition property for carbon steel surface. The inhibition efficiency of ZnO-BTSA is higher than of pure

ZnO. The polarization curves indicate that ZnO is anodic inhibitor while the ZnO-BTSA is a mixed-type inhibitor.

Keywords. Corrosion inhibition, nano-ZnO, carbon steel.

1. MO DAU

Ldp phli bao ve hiru co la phuong phap dugc sii

dyng nhieu de bao ve chdng an mdn cho cac ciu

kien sat thep do hi^u qui cao vcd gia thanh hgp ly.

Hieu qua bao ve chdng an mdn cua Idp phii dugc

kilm soat theo 3 co che: rio chin, bam dinh va lic

che an mdn [1,2]. Cac logi bgt mau hoat tinh thudng

dugc dua vao mang son, ben cgnh chiic nang thim

my cdn cd tac dung nhu chit gia cudng tiiy myc dich

sii dung. Oxit kem dugc sii dyng rat nhieu frong

cdng nghi?p son nhu mdt loai bgt mau fring va cd

tac dung nhu chit hip phy tia tu ngogi, giu cho

mang son khdng bi suy giim do tac d^ng tur ngogi

[3, 4]. Tuy nhien, vi?c sii dyng bgt ZnO d ldp son

ngoai cimg ciing the hien su bat lgi do lam giam do

trong suot ciia Idp son phii ngoai. Dieu bit cgp nay

dugc khic phyc Idii su dyng cac hgp chit nay d kich

thuoc nanomet. Da cd nhirng cdng frinh cdng bd sir

dyng hgt oxit kem nano lam cii thign kha nang

chdng an mdn ciia mang son do tang cudng tinh

nang rao chan nhd lien kit vdi ldp phii, lam giam

dudng din cic tic nhan xam th\rc tdi nen thep. Hon

nifa, khi dua nano ZnO vao mang son, svr cd mgt ciia

nano ZnO lam cham qua trinh suy giim do tac ddng

ciia fra fri ngoai [5-7].

Gin day, bgt nano-ZnO da dugc sii dung frong

mang scm nhu tac nhan luu giO' chit ire che an mdn,

lam chim phan ihig an mdn kim loai khi mang son

bj xudc hay bi pha hiiy do mdi trudng ben ngoai [8].

Bai bao nghien ciiu bien ti'nh nano-ZnO bing

chit lie che an mdn gdc hChi co 2-benzothia￾zolylthio-succinic axit dl su dyng nhu phy gia lic

che an mdn frong Idp phu epoxy. Kha nang lie ehe

an mdn ciia nano-ZnO biin tinh dugc khao sat sit

dyng phuong phap tdng frd di?n hda va do dudng

cong phan cgc.

2. THUC NGHIEM

Cac hda chat chinh dugc sir dyng frong nghien

ciiu la cac hda chat tinh kliilt gom: NaOH (98 %),

(CH3COO)2Zn (98 %), etanol (> 99,5°), xuit xir

Merck.

2-benzothiazolylthio-succinic axit (BTSA) cua

Ciba, cd cdng thiic cau tao nhu sau:

cc: v

Quy trinh chi tao vat li?u nano-ZnO: Hda tan

(CH3COO)2Zn va NaOH trong etanol, them tir tur

dung djch NaOH vao dung dich (CH3COO)2Zn din

khi dgt gia tn pH 8-10 trong khi khuiy lien tuc.

Khuiy dung djch frong 2 gid va d% yen 12 gid d

nhi?t do phdng, thu hoi nano-ZnO bing phuong

phap ly tam, nia sach bing etanol, siy chan khdng d

60 "C frong 24 gid.

Quy trinh biin ti'nh nano-ZnO bing BTSA

(ZnO-BTSA): hda tan BTSA trong etanol, cho tir tii

ZnO vao va khuiy lien tyc d nhi?t dg phdng frong 2