Cytotoxicity of amorphous calcium phosphate (ACP) and chitosan lactate (ChOL)
multifunctional and hybrid composite coatings on MRC-5 human lung fibroblast
cell line is elucidated. ACP/TiO2 and ACP/TiO2/ChOL are deposited onto Ti by
novel in situ anodization/anaphoretic process at constant voltage.
Cytotoxicity tests showed that there was no significant decrease in the
survival of healthy MRC-5 cells eposed to composite samples without chitosan
lactate, while there was an increase in the number of viable cells in the
sample containing ChOL. The findings show that there is improved cell
proliferation, differentiation and cell viability in the ChOL-containing
sample, which makes ACP/TiO2/ChOL coating a good candidate for the
applications in medicine and stomatology.
The influence of the microstructure of the X5CrNi18-10 stainless steel welded
joint on its resistance to general, pitting, and intergranular corrosion was
analysed. The structure of weld metal, heat affected zone (HAZ) and base
metal before and after electrochemical testing was analysed using SEM/EDS.
The influence of the roughness level of the welded joint on its resistance
to the mentioned types of corrosion was examined as well. Although the
degree of sensitization of HAZ was significantly lower than the limit value,
HAZ showed a noticeably greater tendency to general and pitting corrosion
than weld metal and base metal. Polishing has been shown to significantly
improve the corrosion resistance of HAZ than in the case of other parts of
the welded joint.
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