Identification of an anomalous phase in Ni–W electrodeposits

Mizushima, Io; Tang, Peter Torben; Somers, Marcel A. J.

doi:10.1016/j.surfcoat.2007.12.016

Cited by 12 publications

(5 citation statements)

References 18 publications

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“…As the results reported in the literature by Younes [26] and Yamasaki [27], the electrodeposited Ni-W alloy coatings presented as an amorphous state when Similar peak has been observed by Mizushima et al [28] and Jus ˇk_ enas et al [29]. The former proposed that it is the codeposition of nanocrystalline Ni(-W) and Ni-W-C phases [28]. However, Jus ˇk_ enas et al [29] explicitly claimed that the form of C in the electrodeposited Ni-W coatings must be related to the presence of citric complexes and the peak at 41.4°was corresponded to NiWO 4 .…”

Section: Characterization Of Ni-w-cr 2 O 3 Nanocomposite Coatingsupporting

confidence: 83%

“…4a). As the results reported in the literature by Younes [26] and Yamasaki [27], the electrodeposited Ni-W alloy coatings presented as an amorphous state when Similar peak has been observed by Mizushima et al [28] and Jus ˇk_ enas et al [29]. The former proposed that it is the codeposition of nanocrystalline Ni(-W) and Ni-W-C phases [28].…”

Section: Characterization Of Ni-w-cr 2 O 3 Nanocomposite Coatingsupporting

confidence: 67%

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Electrodeposition and Characterization of Ni–W–Cr2O3 Nanocomposite Coating

Zhang

Leng

Wang

et al. 2017

Metallogr. Microstruct. Anal.

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In this paper, compact Ni-W and Ni-W-Cr 2 O 3 nanocomposite coatings were deposited on mild steel substrates by DC electrodeposition method. The surface morphology, elemental composition, and structure of the obtained coatings were investigated by scanning electron microscopy, energy dispersive spectrometer, and x-ray diffraction. The corrosion resistance was evaluated by potentiodynamic polarization (Tafel) and electrochemical impedance spectroscopy. It is shown that incorporation of Cr 2 O 3 nanoparticles into amorphous Ni-W coating would transform its structure into crystalline and influence its properties. The microhardness of Ni-W-Cr 2 O 3 nanocomposite coatings (717-764 HV0.1) is significantly bigger than that of Ni-W coating (687 HV0.1). In addition, with increase of Cr 2 O 3 addition in the electroplating bath, a tendency of improvement in hardness and corrosion resistance performance is observed. Finally, an excellent Ni-W-Cr 2 O 3 nanocomposite coating with a slightly lower resistance and much higher hardness compared with Ni-W coating is electrodeposited in the bath containing 20 g/L Cr 2 O 3 nanoparticles.

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Section: Characterization Of Ni-w-cr 2 O 3 Nanocomposite Coatingsupporting

confidence: 83%

Section: Characterization Of Ni-w-cr 2 O 3 Nanocomposite Coatingsupporting

confidence: 67%

Electrodeposition and Characterization of Ni–W–Cr2O3 Nanocomposite Coating

Zhang

Leng

Wang

et al. 2017

Metallogr. Microstruct. Anal.

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“…Tungsten alloy electrodepositions, which act as deposits for chromium replacement and possess many excellent characters, such as high melting point, high hardness, excellent wear resistance and anti-attrition performance have drawn increasing attentions. Tungsten has been introduced into the NiFe alloy coatings to promote the grain refining and to improve the uniformity of organization, the surface hardness as well as the high temperature performance of the alloy coating [1][2][3][4]. NiW alloy coatings own the advantages of compact structure, high hardness and good temperature performance.…”

Section: Introductionmentioning

confidence: 99%

Effects of electrolyte concentration and current density on the properties of electro-deposited NiFeW alloy coatings

Sun

Zhao

et al. 2017

Bull Mater Sci

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NiWP alloy coatings were prepared by electrodeposition, and the effects of ferrous chloride (FeCl 2), sodium tungstate (Na 2 WO 4) and current density (D K) on the properties of the coatings were studied. The results show that upon increasing the concentration of FeCl 2 , initially the Fe content of the coating increased and then tended to be stable; the deposition rate and microhardness of coating decreased when the cathodic current efficiency (η) initially increased and then decreased; and for a FeCl 2 concentration of 3.6 g l −1 , the cathodic current efficiency reached its maximum of 74.23%. Upon increasing the concentration of Na 2 WO 4 , the W content and microhardness of the coatings increased; the deposition rate and the cathode current efficiency initially increased and then decreased. The cathodic current efficiency reached the maximum value of 70.33% with a Na 2 WO 4 concentration of 50 g l −1 , whereas the deposition rate is maximum at 8.67 µm h −1 with a Na 2 WO 4 concentration of 40 g l −1. Upon increasing the D K , the deposition rate, microhardness, Fe and W content of the coatings increased, the cathodic current efficiency increases first increased and then decreased. When D K was 4 A dm −2 , the current efficiency reached the maximum of 73.64%.

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“…Τα επιστρώματα είχαν πάχος περίπου 50 μm , περιείχαν βολφράμιο 7 % at και 11 % at αντίστοιχα Η κορυφή στη γωνία 2θ=41,4 ο στο διάγραμμα περίθλασης των ακτίνων Χ πιθανόν να αντιστοιχεί στην ενδομεταλλική ένωση NiW 2 . Η ανώμαλη αυτή, μετασταθής, φάση, που εμφανίζεται στο διάγραμμα περίθλασης των ακτίνων Χ , στη γωνία 2θ = 41,4 ο , και η οποία σε υψηλότερη θερμοκρασία τείνει να αποσυντεθεί , έγινε προσπάθεια να ταυτοποιηθεί με μικροσκόπιο διέλευσης δέσμης ηλεκτρονίων αλλά στάθηκε αδύνατο λόγω αστάθειας της φάσης κατά τον βομβαρδισμό της με την ηλεκτρονική δέσμη [38] .…”

Section: τέλος ηunclassified

“…Αυτή η ανάπτυξη των κόκκων συχνά παρατηρείται στις θερμικές κατεργασίες νανοκρυσταλλικών υλικών και κατά συνέπεια είναι ένα φαινόμενο που συνοδεύει πάντοτε τη θερμική τους οξείδωση. [38] Το φαινόμενο αυτό δυστυχώς αποτελεί εμπόδιο και περιορίζει τις εφαρμογές και τους ελέγχους σε υψηλότερες θερμοκρασίες. Μία λύση τους προβλήματος αυτού είναι η κραματοποίηση των καθαρών μεταλλικών νανοκρυσταλλικών υλικών με στοιχεία που εμποδίζουν κατά κάποιο τρόπο την ανάπτυξη των κόκκων.…”

Section: τέλος ηunclassified

Ανάπτυξη και ιδιότητες της κραματικής επικάλυψης Ni-W

Plainakis¹,

Πλαϊνάκης²

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ΠΡΟΛΟΓΟΣ -ΕΥΧΑΡΙΣΤΙΕΣ Θα ήθελα να εκφράσω ένα μεγάλο ευχαριστώ στον Επιβλέποντα, την εργασία μου, Καθηγητή Δρα κ. Χρήστο Ν. Παναγόπουλο, αρχικά για την άμεση, και χωρίς επιφυλάξεις, ανταπόκρισή του στην επιθυμία μου για εκπόνηση διδακτορικής διατριβής, στο Εργαστήριο Μεταλλογνωσίας, του τομέα Επιστήμης και Τεχνολογίας των υλικών, καθώς και για τη μετέπειτα συνεχή ενθάρρυνση, επιστημονική καθοδήγηση, ηθική στήριξη και επίβλεψη της, που, όλα αυτά τα χρόνια, με βοήθησαν καθοριστικά να την ολοκληρώσω. Επίσης, θα ήθελα να ευχαριστήσω την Καθηγήτρια κα Χ. Καραγιάννη και την Αν. Καθηγήτρια κα Α.Τσετσέκου, μέλη της Τριμελούς μου Συμβουλευτικής Επιτροπής, για την άμεση και πολύτιμη ηθική και επιστημονική βοήθεια, που μου προσέφεραν.

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Identification of an anomalous phase in Ni–W electrodeposits

Cited by 12 publications

References 18 publications

Electrodeposition and Characterization of Ni–W–Cr2O3 Nanocomposite Coating

Electrodeposition and Characterization of Ni–W–Cr2O3 Nanocomposite Coating

Effects of electrolyte concentration and current density on the properties of electro-deposited NiFeW alloy coatings

Ανάπτυξη και ιδιότητες της κραματικής επικάλυψης Ni-W

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