Preparation and Characterization of Polyamide6/Organic Clay Nanocomposite as protective coating for Carbon Steel

Journal Article
, 26. Layla A. Al Juhaiman, Alanood A. Aljaghwani, Waffa K. Mekhamer . 2020
Publication Work Type
master
Publication Online URL
Magazine \ Newspaper
INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
Issue Number
15
Volume Number
15
Pages
6938 – 6954
Conference Date
Publication Abstract

In this work Polyamide/organic clay nanocomposite (PCN) was successfully prepared. The raw clay was 
collected from Khulays area north of Jeddah in Saudi Arabia. After grinding, it was washed with water, 
thereafter it was saturated with 0.5M NaCl solution to obtain the sodium clay (NaC). To obtain the 
organoclay (OC), the NaC was modified with Cetylpyridinium chloride (CPC). Polyamide6/organoclay 
nanocomposites  (PA6/OC  NCs)  were  prepared  at  1,2,3,4  and  5  wt%  of  OC.  The  PA6/OC 
nanocomposites  were  characterized  using  Fourier  transform  infrared  spectroscopy  (FTIR),  X-ray 
Diffraction (XRD), Scanning electron microscope (SEM) as well as transmission electron microscope 
(TEM). The FT-IR spectra of OC show the appearance of new bands of the constituents of CPC 
which gives an evidence for the presence of the organic component CPC in the OC structure. The XRD 
results for OC showed a shift in d001 spacing from 10.93̊ A for NaC to 20.63̊ A for OC. The XRD results 
for PA6/OC nanocomposites showed the loss of the clay crystalline structure at the low clay loading of 
1-3 wt%. From TEM results, the PA6/OC nanocomposites at 1, 2, and    3wt% of OC showed 
exfoliated structures while the 4 and 5wt% showed small portion of intercalated structure. The SEM 
results for the OC and PA6/OC showed a good homogeneous mixture in the PA6/OC nanocomposites. 
The anticorrosive properties of PA6/OC nanocomposites coatings on C-Steel were investigated using 
electrochemical  impedance  spectroscopy  (EIS)  and  Potentiodynamic  polarization  in  3.5  wt%  NaCl 
electrolyte. Results showed that the PA6/OC nanocomposite coatings have better corrosion protection 
of C-Steel than pure PA6. The PA6/OC nanocomposite coatings containing 5wt% of the OC exhibited 
the best corrosion protection which reached about 75%.