Preparation of sol-gel SiO2 coatings on steel and their corrosion resistance Irina Stambolova, Stancho Yordanov, Lyuben Lakov, Sasho Vassilev, Vladimir Blaskov and Bojidar Jivov MATEC Web Conf., 145 (2018) 05011 Published online: 09 January 2018 DOI: 10.1051/matecconf/201814505011