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W addition led to increase the crystallization temperature and corrosion.
Film beavior was evaluated under chemical and elctrochemical hydrogen charging.
Al45Ti38W17 thin film presented the best hydrogen barrier performance.
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•A new Al-Ti-W thin film was developed.•Thin films were deposited by magnetron sputtering on steel substrates.•The influence of W addition on the film performance was invesitgated.•Structure, thermal stability and mechanical properties were analysed.•The amorphous state was confirmed with a W content ≤ 17 at%.•Corrosion behavior of the coatings in a NS4 solution was evaluated.
Thin film represents a promising alternative for the protection of metallic structures against hydrogen embrittlement and corrosion degradation. Al-Ti-W coatings were deposited by magnetron sputtering technique using three pure metallic targets. Tungsten was incorporated in Al-Ti amorphous coating with different contents ranging from 0 to 17 at% by keeping a constant Ti/Al ratio at an average of 0.8. The deposition rate was calculated in order to obtain 4 µm as an uniform film thickness. XRD, DSC and TEM analyses were performed to confirm the amorphous state of the coatings and to determine the glass transition temperature (Tg) and crystallization temperature peak (Tp). These temperatures were increased respectively from 423 °C and 595 °C to 490 °C and 665 °C with the increase of W concentration up to 17 at%. Corrosion resistance in a saline solution decreased with the increase of W content.The incorporation of W element induced an increase of the thin film hardness (H) and Young’s modulus (Er) from 9 GPa to 9.35 GPa and from 117 GPa to 131,79 GPa, respectively. The surface roughness varied with the incorporation of W that strongly influenced the coatings’ corrosion behavior. Chemical and electrochemical hydrogen charging techniques were performed to expose coated steels to hydrogen sources. W addition in the binary Al-Ti coatings strongly enhanced their resistance to hydrogen absorption. The estimated total hydrogen content trapped in the coated steel during a cathodic polarization decreased with the incorporation of W.