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Corrosion of high-velocity oxy-fuel (HVOF) sprayed iron-based amorphous metallic coatings for marine pump in sodium chloride solutions / Y. Wang in Materials and corrosion, Vol. 63 N° 8 (Août 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 8 (Août 2012) . - pp. 685–694 Titre : Corrosion of high-velocity oxy-fuel (HVOF) sprayed iron-based amorphous metallic coatings for marine pump in sodium chloride solutions Type de document : texte imprimé Auteurs : Y. Wang, Auteur ; Y. G. Zheng, Auteur ; W. Ke, Auteur Année de publication : 2013 Article en page(s) : pp. 685–694 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Amorphous  structures;  EIS;  metallic  coatings;  passivity;  polarization;  stainless  steel Résumé : FeCrMoMnWBCSi amorphous metallic coatings (AMCs) were deposited onto the 304 stainless steel (base material of pump impeller operated in sand-containing seawater) by high-velocity oxygen-fuel (HVOF) thermal spray. The preparation, microstructural characteristics, and static corrosion behavior of the AMCs were presented. The microstructure and corrosion behavior of the AMCs were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), differential scanning calorimetry (DSC), and electrochemical methods. Melt-spun ribbon and 304 stainless steel were also used for comparison purposes. The results indicated that the AMCs can spontaneously passivate with a wide passive region, and much higher ability to withstand pitting corrosion than that of the 304 stainless steel for the high pitting resistance equivalent value. The passive current density of the AMCs was at least two orders of magnitude higher than the counterpart ribbon, which showed a slightly decreased uniform corrosion resistance of the AMCs due to the incompact structure and porosity. The corrosion resistance of the AMCs increased with the coating thickness and decreased with the concentration of NaCl solution. A stable passivation ability held in the AMCs endowed them suitably used in marine environments. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106211/abstract [article] Corrosion of high-velocity oxy-fuel (HVOF) sprayed iron-based amorphous metallic coatings for marine pump in sodium chloride solutions [texte imprimé] / Y. Wang, Auteur ; Y. G. Zheng, Auteur ; W. Ke, Auteur . - 2013 . - pp. 685–694. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 8 (Août 2012) . - pp. 685–694 Mots-clés : Amorphous  structures;  EIS;  metallic  coatings;  passivity;  polarization;  stainless  steel Résumé : FeCrMoMnWBCSi amorphous metallic coatings (AMCs) were deposited onto the 304 stainless steel (base material of pump impeller operated in sand-containing seawater) by high-velocity oxygen-fuel (HVOF) thermal spray. The preparation, microstructural characteristics, and static corrosion behavior of the AMCs were presented. The microstructure and corrosion behavior of the AMCs were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), differential scanning calorimetry (DSC), and electrochemical methods. Melt-spun ribbon and 304 stainless steel were also used for comparison purposes. The results indicated that the AMCs can spontaneously passivate with a wide passive region, and much higher ability to withstand pitting corrosion than that of the 304 stainless steel for the high pitting resistance equivalent value. The passive current density of the AMCs was at least two orders of magnitude higher than the counterpart ribbon, which showed a slightly decreased uniform corrosion resistance of the AMCs due to the incompact structure and porosity. The corrosion resistance of the AMCs increased with the coating thickness and decreased with the concentration of NaCl solution. A stable passivation ability held in the AMCs endowed them suitably used in marine environments. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106211/abstract

Intergranular attack and intergranular stress corrosion cracking of Alloy 690 TT in high temperature lead-containing caustic solution / Y. Hu in Materials and corrosion, Vol. 63 N° 3 (Mars 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 3 (Mars 2012) . - pp. 238–246 Titre : Intergranular attack and intergranular stress corrosion cracking of Alloy 690 TT in high temperature lead-containing caustic solution Type de document : texte imprimé Auteurs : Y. Hu, Auteur ; J. Wang, Auteur ; W. Ke, Auteur Année de publication : 2012 Article en page(s) : pp. 238–246 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Alloy  690  TT;  intergranular  attack;  intergranular  stress  corrosion  cracking;  oxide  film Résumé : Immersion tests were carried out in high temperature lead-containing caustic solution in a static autoclave. The results showed samples with three surface statuses of Alloy 690 TT suffered from intergranular attack (IGA) after immersion in 10% sodium hydroxide (wt%) with 10 g/L of litharge at 330 °C for different times. With the increasing immersion time, IGA became more severe. Wire cutting samples had the most serious IGA, ground samples followed and electro-polished samples had the slightest IGA. IGA had developed into IGSCC only in wire cutting samples due to the existence of residual stress. All the specimens at different immersion time tests lost weight. To the same cold-work samples, with the increasing immersion time, the weight loss increased. No IGA was found in 10% sodium hydroxide solution at 330 °C after 720 h immersion. When adding 100 ppm litharge into 10% sodium hydroxide solution, slight IGA was produced. IGA became more serious and the weight loss of the specimens with three surface statuses increased with the increase of lead concentration. As the results of 1% sodium hydroxide solution containing 10 g/L litharge and 4% sodium hydroxide solution containing 10 g/L litharge at 330 °C for 720 h immersion tests, only slight IGA occurred and the weight of samples with three surface statuses increased. The pH value played an important role in lead-induced corrosion in caustic solution. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005725/abstract [article] Intergranular attack and intergranular stress corrosion cracking of Alloy 690 TT in high temperature lead-containing caustic solution [texte imprimé] / Y. Hu, Auteur ; J. Wang, Auteur ; W. Ke, Auteur . - 2012 . - pp. 238–246. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 3 (Mars 2012) . - pp. 238–246 Mots-clés : Alloy  690  TT;  intergranular  attack;  intergranular  stress  corrosion  cracking;  oxide  film Résumé : Immersion tests were carried out in high temperature lead-containing caustic solution in a static autoclave. The results showed samples with three surface statuses of Alloy 690 TT suffered from intergranular attack (IGA) after immersion in 10% sodium hydroxide (wt%) with 10 g/L of litharge at 330 °C for different times. With the increasing immersion time, IGA became more severe. Wire cutting samples had the most serious IGA, ground samples followed and electro-polished samples had the slightest IGA. IGA had developed into IGSCC only in wire cutting samples due to the existence of residual stress. All the specimens at different immersion time tests lost weight. To the same cold-work samples, with the increasing immersion time, the weight loss increased. No IGA was found in 10% sodium hydroxide solution at 330 °C after 720 h immersion. When adding 100 ppm litharge into 10% sodium hydroxide solution, slight IGA was produced. IGA became more serious and the weight loss of the specimens with three surface statuses increased with the increase of lead concentration. As the results of 1% sodium hydroxide solution containing 10 g/L litharge and 4% sodium hydroxide solution containing 10 g/L litharge at 330 °C for 720 h immersion tests, only slight IGA occurred and the weight of samples with three surface statuses increased. The pH value played an important role in lead-induced corrosion in caustic solution. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005725/abstract