This work presents a study of a hard chromiumplating process using low concentration H2CrO4 baths. Inparticular, the effect of different values of CrO3/H2SO4 ratioon coating properties such as adhesion, hardness, surfaceroughness, apparent density and microstructure were considered.To increase the solution conductivity, avoiding longdeposition times and low throwing power typical of dilutesolutions, the behaviour of various inorganic compoundswas investigated. Specifically, the compounds suitable forobtaining brighter coatings with lower surface roughnessvalues than those obtained using Fink’s solutions wereNa2SO4 and Al2(SO4)3 9 18H2O. A bath composition wasidentified, with a limited use of Cr(VI) in a solution able toproduce coatings with a better surface roughness than thoseof conventional industrial baths.
CHROMIUM ELECTRODEPOSITION FROM Cr(VI) LOW CONCENTRATION SOLUTIONS / Fontanesi, Claudio; Giovanardi, Roberto; Cannio, Maria; E., Soragni. - In: JOURNAL OF APPLIED ELECTROCHEMISTRY. - ISSN 0021-891X. - STAMPA. - 38:4(2008), pp. 425-436. [10.1007/s10800-007-9455-5]
CHROMIUM ELECTRODEPOSITION FROM Cr(VI) LOW CONCENTRATION SOLUTIONS.
FONTANESI, Claudio;GIOVANARDI, Roberto;CANNIO, Maria;
2008
Abstract
This work presents a study of a hard chromiumplating process using low concentration H2CrO4 baths. Inparticular, the effect of different values of CrO3/H2SO4 ratioon coating properties such as adhesion, hardness, surfaceroughness, apparent density and microstructure were considered.To increase the solution conductivity, avoiding longdeposition times and low throwing power typical of dilutesolutions, the behaviour of various inorganic compoundswas investigated. Specifically, the compounds suitable forobtaining brighter coatings with lower surface roughnessvalues than those obtained using Fink’s solutions wereNa2SO4 and Al2(SO4)3 9 18H2O. A bath composition wasidentified, with a limited use of Cr(VI) in a solution able toproduce coatings with a better surface roughness than thoseof conventional industrial baths.
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