Influence of Zirconia and Organic Additives on Mechanical and Electrochemical Properties of Silica Sol-Gel Coatings.

Jolanta Gąsiorek,Wilhelm Jan Tic,Anna Szczurek,Justyna Krzak,Joanna Guziałowska-Tic,Bartosz Babiarczuk,Jerzy Kaleta,Anna Mazur-Nowacka

doi:10.3390/ma14092389

Abstract

This paper presents the result of the investigation of organically modified silica (ORMOSIL)-zirconia coatings used to enhance their protective properties, namely corrosion and scratch resistance. Two different materials, i.e., SiO2/ZrO2 and SiO2/GPTMS/ZrO2, were synthesized, measured, and analyzed to find the difference in the used organosilane precursor (dimethyldiethoxysilane and (3-glycidoxypropyl)trimethoxysilane, respectively). SiO2/ZrO2 coatings showed higher hardness than SiO2/GPTMS/ZrO2. Moreover, the value of polarization resistance (Rp) for SiO2/GPTMS/ZrO2 coated 316L steel relative to the uncoated one was obtained. It was nearly 84 times higher. The coating delamination was observed with load 16N. Additionally, the corrosion mitigation for 316L coated by SiO2/GPTMS/ZrO2 was observed even after extended exposure to corrosion agents.

Highlights

IntroductionMany types of coatings, including inorganic or organic ones (paints, enamels, and lacquers) produced to protect against corrosion were developed as a result of modern technological advances
Many types of coatings, including inorganic or organic ones produced to protect against corrosion were developed as a result of modern technological advances
Taking into consideration the elimination of fluorinated compounds used in corrosion protection, the application of various sol-gel oxide matrices modified by organic groups (ORMOSIL), inhibitors [8,9,10], or nanoparticles [10,11,12] may be a successful alternative

Summary

Introduction

Many types of coatings, including inorganic or organic ones (paints, enamels, and lacquers) produced to protect against corrosion were developed as a result of modern technological advances. The sol-gel method allows good corrosion protection capabilities to be attained thanks to the possibility of using the numerous types of sol-gel synthesis precursors, other reagents (e.g., inhibitors), and chemical or physical treatments (e.g., etching or polishing). It makes it possible to obtain coatings with wear resistance properties in a corrosive environment [1,2,3,4,5,6,7]. Taking into consideration the elimination of fluorinated compounds used in corrosion protection, the application of various sol-gel oxide matrices modified by organic groups (ORMOSIL), inhibitors [8,9,10], or nanoparticles [10,11,12] may be a successful alternative

Methods

Results

Conclusion