The present research is focused on a formulation with two active components as an
anticorrosive polymer coating for 15CDV6 steel. The dual component formulation (epoxy-zinc
phosphate (ZP) coating) consists of a polymeric epoxy resin Bisphenol A diglycidyl ether (DGEBA)
cured with a polyaminoamide as a first component and zinc phosphate (Zn3(PO4)2(H2O)4) (ZP)
added in 5% by weight as a second component. The anticorrosive performance of the epoxy-ZP
coating was evaluated against the standard coating, which consists of only one component, the cured
polymeric epoxy resin. The two polymer coatings were evaluated by electrochemical impedance
spectroscopy (EIS). The surface morphology was of the two polymer coatings were characterized
by scanning electron microscopy (SEM). The coated samples of 15CDV6 steel were tested in a harsh
environment of corrosive electrolytes (3 wt % NaCl solution). Under these conditions, a very high
impedance value was obtained for 15CDV6 steel coated with the epoxy-ZP coating. Even after
exposure for a long period of time (5856 h), the performance was still acceptable, indicating that the
epoxy-ZP coating is an excellent barrier. The standard epoxy coating provided an adequate corrosion
protection performance for a short period of time, then the performance started to decline. The results
were confirmed by surface characterization, a cross-sectional image obtained by optical microscopy
for an epoxy-ZP coating applied on 15CDV6 steel exposed for 5856 h to a salt spray test showed that
the coating is homogeneous and adheres well to the surface of the steel. So, the coating with a dual
component could have great potential in marine applications as anticorrosive for steel.

العنوان

coatings

الناشر

MDPI

بلد الناشر

سويسرا

Indexing

Thomson Reuters

معامل التأثير

2,313

نوع المنشور

مطبوع فقط

المجلد

9

السنة

2019

الصفحات

463