The improvement of high-temperature oxidation of α2-Ti3Al by anodic coating in the phosphoric acid with sodium silicate

Wu, S.K.; Yang, Ming‐Der; You, JK

doi:10.1016/j.intermet.2006.04.003

Cited by 7 publications

(2 citation statements)

References 5 publications

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“…Microalloying additions of chlorine, phosphorus, and boron have a tremendous effect on the oxidation behaviour of Ti-Al [1,2]. Intensive studies on the oxidation mechanism have been performed so far for chlorine [1][2][3][4][5][6] but also, and more recently for phosphorus [7][8][9][10][11][12][13][14][15][16]. Many studies show that a phosphoric acid treatment improves the high temperature oxidation resistance in air of α-iron [7] and some alloys.…”

Section: Introductionmentioning

confidence: 99%

Effect of Phosphoric Acid Treatment on Isothermal High Temperature Oxidation Behaviour of AISI 304 Stainless Steel at 800°C

Riffard

Buscail

Rabaste

et al. 2012

DDF

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Phosphoric acid treatment is used as a way to improve the high temperature oxidation resistance of a chromia-forming AISI 304 steel. Chromia-forming steels are excellent candidates to resist to high temperature oxidizing atmospheres because of the formation of protective oxide scales. The oxide scale growth mechanisms are studied by exposing phosphoric acid-treated and untreated 304 steel samples to high temperature conditions in air. The analyses were carried out by means of thermogravimetry, andin situX-ray diffraction (XRD). The experimental results show that the phosphoric acid treatment does not have a beneficial effect on cyclic high temperature oxidation (up to 70h of the oxidation test) of AISI 304 steel because of growth of a layer mainly formed by external cation diffusion which grows very quickly. The isothermal high temperature oxidation of this steel at 800°C in air shows a very fast initial iron oxidation towards the external interface, allowing to chromium element to be more available to the internal interface to form a continuous chromia layer, thus causing the establishment of a parabolic oxidation regime and leading to a beneficial reduction of the oxidation rate (after 70h of the oxidation test).

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Section: Introductionmentioning

confidence: 99%

Effect of Phosphoric Acid Treatment on Isothermal High Temperature Oxidation Behaviour of AISI 304 Stainless Steel at 800°C

Riffard

Buscail

Rabaste

et al. 2012

DDF

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“…Works implying phosphorus element, introduced either by ionic implantation [19] or by superficially applying a concentrated (85 wt.%) phosphoric acid solution [20], have shown a large decrease of the weight gains registered during high temperature oxidation tests. Some authors have developed coatings on titanium or titaniumaluminium samples by anodising in phosphoric acid solutions [21,22] and in some cases an increase of high temperature resistance was observed [23,24]. However, the way phosphorus plays a role still remains not clear.…”

Section: Introductionmentioning

confidence: 99%

Improvement of High-Temperature Oxidation of Titanium Alloys by Dipping in a Phosphoric Acid Solution

Brou

Bonnet

Grosseau-Poussard

2008

MSF

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Gamma-TiAl samples were treated by phosphoric acid solutions at different concentrations. With 15 mol/dm3, a viscous deposit was left on the surface leading, after drying and high temperature oxidation, to a very heterogeneous surface aspect. Concentrations below 0.5 mol/dm3 were then used and allowed to greatly ameliorate the homogeneity of the superficial layer. After heating from ambient to oxidation temperature, however, cracks were always observed, due to the departure of gaseous molecules. Isothermal oxidation tests come out at 800°C and 900°C under reconstituted air showed that weight gains were strongly reduced when TiAl had been treated. A compound containing titanium, oxygen and phosphorus was detected at the end of the heating period, identified as titanium pyrophosphate, TiP2O7. This compound remained the only one detected for 100 h when oxidation was come out at 800°C, but evolved towards TiO2 when oxidation time was increased. In the case of oxidation at 900°C, the evolution from TiP2O7 to TiO2 also happened but appeared to go faster.

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High-temperature oxidation of hot-dip aluminizing coatings on a Ti3Al–Nb alloy and the effects of element additions

et al. 2012

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The improvement of high-temperature oxidation of α2-Ti3Al by anodic coating in the phosphoric acid with sodium silicate

Cited by 7 publications

References 5 publications

Effect of Phosphoric Acid Treatment on Isothermal High Temperature Oxidation Behaviour of AISI 304 Stainless Steel at 800°C

Effect of Phosphoric Acid Treatment on Isothermal High Temperature Oxidation Behaviour of AISI 304 Stainless Steel at 800°C

Improvement of High-Temperature Oxidation of Titanium Alloys by Dipping in a Phosphoric Acid Solution

High-temperature oxidation of hot-dip aluminizing coatings on a Ti3Al–Nb alloy and the effects of element additions

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