Modification of 2205 duplex stainless steel properties through solution heat treatment and surface enhancement with sol gel coatings for biomedical applications
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Heat treatment and surface modification with a layer of titania (TiO2) and TiO2-SiO2 composite coating with varyingcompositions (from 0 to 40 mol% SiO2) by sol gel dip coating technique on 2205 duplex stainless steel. As a precucer fortitania, titanium isopropoxide, for silica, tetraethyl orthosilicate were used and hydrochloric acide as a catalyst, ethanolas solvent and diethanolemaine as dispersant microstructure analysis after heat treatment was studied SEM, XRD. TheFESEM was used to analyses the coating’s morphology microscopically and EDS. Also surface roughness and contact anglewere evaluated. The corrosion resistance of DSS in Ringer’s solution was investigated by photodynamic polarization. Thestudy aims to assess DSS’s capabilities for bio applications to replace austenitic grades. The heat treatment gives a balancedmicrostructure and no precipitation of secondary phases. The sol-gel approach proved effective in producing a homogenousand dense layer of titania and composite coatings, increased roughness after coating therefore reducing the contact angle andmaking it more hydrophilic, making it suitable for bio application with the nano composite coating producing the best results. It is due to its smooth surface increase film thickness and results showed that sol-gel composite coatings greater bioactivityand enhanced the corrosion resistance of DSS substrates, with the highest improvement percentage (91.95%) at C2 specimen.
Abstract
Heat treatment and surface modification with a layer of titania (TiO2) and TiO2-SiO2 composite coating with varyingcompositions (from 0 to 40 mol% SiO2) by sol gel dip coating technique on 2205 duplex stainless steel. As a precucer fortitania, titanium isopropoxide, for silica, tetraethyl orthosilicate were used and hydrochloric acide as a catalyst, ethanolas solvent and diethanolemaine as dispersant microstructure analysis after heat treatment was studied SEM, XRD. TheFESEM was used to analyses the coating’s morphology microscopically and EDS. Also surface roughness and contact anglewere evaluated. The corrosion resistance of DSS in Ringer’s solution was investigated by photodynamic polarization. Thestudy aims to assess DSS’s capabilities for bio applications to replace austenitic grades. The heat treatment gives a balancedmicrostructure and no precipitation of secondary phases. The sol-gel approach proved effective in producing a homogenousand dense layer of titania and composite coatings, increased roughness after coating therefore reducing the contact angle andmaking it more hydrophilic, making it suitable for bio application with the nano composite coating producing the best results. It is due to its smooth surface increase film thickness and results showed that sol-gel composite coatings greater bioactivityand enhanced the corrosion resistance of DSS substrates, with the highest improvement percentage (91.95%) at C2 specimen.
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