Effect of Ti pretreatment on photoelectric properties of TiO2 layers prepared by plasma-anodic oxidation

Mikula, Milan; Blecha, Jozef; Čeppan, Michal; Panák, Ján

doi:10.1007/bf01692004

Cited by 3 publications

(2 citation statements)

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“…These anodic growth parameters were chosen to produce a thick oxide layer while avoiding its "sparking breakdown," when the layer becomes dull and grey. [10][11] In photocorrosion experiments, direct illumination by a 250-W mercury (Hg) medium-pressure lamp through a tempered glass filter (310 nm) was used. The radiation intensity (~ 100 mW/cm 2 ) was energetically comparable to sunlight irradiation.…”

Section: Introductionmentioning

confidence: 99%

Photocorrosion of Passive Films on Titanium in Sulfuric Acid

1995

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Passive films formed anodically on titanium (Ti) plates in 0.5 M sulfuric acid (H 2 SO 4 ) were corroded in aqueous solutions of H 2 SO 4 in the dark and under illumination of a 250-W mercury (Hg) lamp. The corrosion depth was determined by calculating the thickness of the oxide layers from interference patterns of reflection spectra in the visible region. Corrosion was observed at pH ≤ 3, with the corrosion rate increasing exponentially with decreasing pH and achieving a maximum value at pH ~ 1. Photocorrosion generally was quicker than corrosion occurring in the dark in all cases (i.e., open-circuit, short-circuit, bias conditions) and increased under anodic polarization of the oxide electrode together with the photocurrent. Corrosion occurring in the dark decreased very weakly under anodic polarization. Long-term corrosion experiments indicated the initial corrosion rate for a thick anodic oxide was higher than the later rates, probably because of the different oxide quality within the cross section.

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Section: Introductionmentioning

confidence: 99%

Photocorrosion of Passive Films on Titanium in Sulfuric Acid

1995

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“…The barrier prevents the generation of a single spark and thus a point burning of the foil. A relatively homogeneous discharge composed of many constantly moving microsparks spreads in the air gap [4] (the nonconductive barrier causes a low real component of the electric current and disables a discharge performance in DC conditions).…”

Section: Introductionmentioning

confidence: 99%

Surface and adhesion changes of atmospheric barrier discharge-treated polypropylene in air and nitrogen

Mikula¹,

Jakubíková²,

Zahoranová³

2003

Journal of Adhesion Science and Technology

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Oriented polypropylene treated by atmospheric barrier discharges in air and nitrogen was investigated using several techniques: contact angle measurements, ATR -FT-IR spectroscopy and two adhesion tests based on the stripping of an applied ink layer. The activation in an air discharge was found to be much weaker compared to the activation in industrial grade nitrogen, particularly with respect to adhesion. The adhesion was found to be much better in nitrogen in spite of the common use of air in industrial 'corona discharges'. A new 'abrasive shear-stripping' (AS) test for ink coating adhesion was designed and performed. It was shown that the AS test was much more sensitive than the classical adhesive tape test and was sensitive enough to monitor ageing and overtreatment. The contact angle measurements did not correlate completely with the adhesion properties and could not monitor the overtreatment, while the ATR -FT-IR technique indicated changes just for overtreated foils.

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