Corrosion Protection of Carbon Steel Using Zirconium Oxide/Silane Pretreatment and Powder Coating

Abstract

Surface pretreatment plays important role in improvement of corrosion resistance and adhesion of organic coatings. A new generation of metal pretreatments based on nanosize zirconium oxide or ogranosilane film has been investigated recently as an alternative method to phosphatation. In this paper, ZrO2/silane composite film on carbon steel was prepared and characterised by field emission scanning electron microscopy, energy dispersive X-ray spectrum and electrochemical measurements. The effect of ZrO2/silane surface treatment on the protection properties of powder coating was studied by salt spray test and adhesion measurement. The results obtained showed that ZrO2 was rapidly precipitated on the steel surface after first 1 minute immersion and ZrO2/silane film formed after 4 minutes immersion give best protective properties. Powder coating on carbon steel with ZrO2/silane pretreatement has equivalent protection performance like powder coating with phosphate pretreatment.

Effect of zirconia in the corrosion behavior of intermetallic Mo3Si alloy in molten salts mixture of NaNO3 and KNO3

“…[12] Also, Mo 3 Si forms porosities during its transients oxidation state, allowing oxygen diffusion in the substrate, promoting volatile MoO 3 loss, and segregation of Si in grain boundaries. [13][14][15][16] Based on the last paragraphs, the present research focused on the evaluation of the effect of zirconia addition on the corrosion resistance of Mo 3 Si intermetallic alloy in 60 wt.% NaNO 3 , 40 wt.% KNO 3 at 600°C as well as the microstructural effects of Zr addition into the Mo 3 Si intermetallic alloy. To achieve this goal, electrochemical techniques were used.…”