Andreea Pertache - Academia.edu (original) (raw)

Papers by Andreea Pertache

Research paper thumbnail of Thin black layers on aluminum substrate—electrochemical synthesis and characterization

Surface and Interface Analysis, 2008

The article presents some preliminary experimental results dealing with electrochemical synthesis... more The article presents some preliminary experimental results dealing with electrochemical synthesis and morphological, optical characterization of various types of black layers onto Al substrates, involving both inorganic metallic salts of nickel, molybdenum, and conducting polymers, respectively, polypyrrole layers. The article discusses a new procedure for direct electrodeposition of black Ni, black layers based on Mo compounds during a cathodic process as well as black composite polypyrrole films during anodic oxidation that involves an initial anodizing in nitric acid electrolyte that proved to offer a very good adherence of the metal then plated on Al surfaces. Al surface morphology evolution against applied c.d. and duration during initial anodizing was also investigated, by SEM technique. The obtained black layers are characterized by a good throwing power, homogeneity, smoothness, and adherence. Also, black layers formed by a.c. electrochemical coloring in Ag-and Ni-based solutions are discussed. Optical characterization has been also performed to evaluate their solar absorptance and thermal emittance coefficients and a comparative evaluation is presented.

Research paper thumbnail of Comportarea la coroziune a unor materiale metalice (oþel turnat, fonte) din construcþia pompelor, în contact cu ape de zãcãmânt petroliere

S-au efectuat determinări comparative privind variaţia în timp a potenţialului în circuit deschis... more S-au efectuat determinări comparative privind variaţia în timp a potenţialului în circuit deschis (faţă de Ag/AgCl), curbe de polarizare în regim potenţiodinamic şi spectre de impedanţǎ electrochimică (Bode, Nyquist) pentru oţel turnat OT450 şi fonte cenuşii (GJL HB215 şi GJL HB155) în apǎ de zǎcǎmânt de la sonde româneşti, la temperaturi de 22, 40 şi 60 0 C, în diferite condiţii hidrodinamice de agitarea electrolitului. Pentru fitarea rezultatelor experimentale de impedanţă electrochimică s-au propus trei modele de circuit electric echivalent

Research paper thumbnail of Black Layers on Aluminum Substrate – Evaluation of Corrosion Behavior

Advanced Materials Research, 2008

Research paper thumbnail of Thin black layers on aluminum substrate—electrochemical synthesis and characterization

Surface and Interface Analysis, 2008

The article presents some preliminary experimental results dealing with electrochemical synthesis... more The article presents some preliminary experimental results dealing with electrochemical synthesis and morphological, optical characterization of various types of black layers onto Al substrates, involving both inorganic metallic salts of nickel, molybdenum, and conducting polymers, respectively, polypyrrole layers. The article discusses a new procedure for direct electrodeposition of black Ni, black layers based on Mo compounds during a cathodic process as well as black composite polypyrrole films during anodic oxidation that involves an initial anodizing in nitric acid electrolyte that proved to offer a very good adherence of the metal then plated on Al surfaces. Al surface morphology evolution against applied c.d. and duration during initial anodizing was also investigated, by SEM technique. The obtained black layers are characterized by a good throwing power, homogeneity, smoothness, and adherence. Also, black layers formed by a.c. electrochemical coloring in Ag- and Ni-based solutions are discussed. Optical characterization has been also performed to evaluate their solar absorptance and thermal emittance coefficients and a comparative evaluation is presented. Copyright © 2008 John Wiley & Sons, Ltd.

Research paper thumbnail of Thin black layers on aluminum substrate—electrochemical synthesis and characterization

Surface and Interface Analysis, 2008

The article presents some preliminary experimental results dealing with electrochemical synthesis... more The article presents some preliminary experimental results dealing with electrochemical synthesis and morphological, optical characterization of various types of black layers onto Al substrates, involving both inorganic metallic salts of nickel, molybdenum, and conducting polymers, respectively, polypyrrole layers. The article discusses a new procedure for direct electrodeposition of black Ni, black layers based on Mo compounds during a cathodic process as well as black composite polypyrrole films during anodic oxidation that involves an initial anodizing in nitric acid electrolyte that proved to offer a very good adherence of the metal then plated on Al surfaces. Al surface morphology evolution against applied c.d. and duration during initial anodizing was also investigated, by SEM technique. The obtained black layers are characterized by a good throwing power, homogeneity, smoothness, and adherence. Also, black layers formed by a.c. electrochemical coloring in Ag-and Ni-based solutions are discussed. Optical characterization has been also performed to evaluate their solar absorptance and thermal emittance coefficients and a comparative evaluation is presented.

Research paper thumbnail of Comportarea la coroziune a unor materiale metalice (oþel turnat, fonte) din construcþia pompelor, în contact cu ape de zãcãmânt petroliere

S-au efectuat determinări comparative privind variaţia în timp a potenţialului în circuit deschis... more S-au efectuat determinări comparative privind variaţia în timp a potenţialului în circuit deschis (faţă de Ag/AgCl), curbe de polarizare în regim potenţiodinamic şi spectre de impedanţǎ electrochimică (Bode, Nyquist) pentru oţel turnat OT450 şi fonte cenuşii (GJL HB215 şi GJL HB155) în apǎ de zǎcǎmânt de la sonde româneşti, la temperaturi de 22, 40 şi 60 0 C, în diferite condiţii hidrodinamice de agitarea electrolitului. Pentru fitarea rezultatelor experimentale de impedanţă electrochimică s-au propus trei modele de circuit electric echivalent

Research paper thumbnail of Black Layers on Aluminum Substrate – Evaluation of Corrosion Behavior

Advanced Materials Research, 2008

Research paper thumbnail of Thin black layers on aluminum substrate—electrochemical synthesis and characterization

Surface and Interface Analysis, 2008

The article presents some preliminary experimental results dealing with electrochemical synthesis... more The article presents some preliminary experimental results dealing with electrochemical synthesis and morphological, optical characterization of various types of black layers onto Al substrates, involving both inorganic metallic salts of nickel, molybdenum, and conducting polymers, respectively, polypyrrole layers. The article discusses a new procedure for direct electrodeposition of black Ni, black layers based on Mo compounds during a cathodic process as well as black composite polypyrrole films during anodic oxidation that involves an initial anodizing in nitric acid electrolyte that proved to offer a very good adherence of the metal then plated on Al surfaces. Al surface morphology evolution against applied c.d. and duration during initial anodizing was also investigated, by SEM technique. The obtained black layers are characterized by a good throwing power, homogeneity, smoothness, and adherence. Also, black layers formed by a.c. electrochemical coloring in Ag- and Ni-based solutions are discussed. Optical characterization has been also performed to evaluate their solar absorptance and thermal emittance coefficients and a comparative evaluation is presented. Copyright © 2008 John Wiley & Sons, Ltd.