INFLUENCE OF THE THICKNESS OF Ni-P COATING APPLIED ON 7075 ALUMINUM ALLOY ON ITS HARDNESS
Kazimierz Czapczyk 1  
,   Piotr Siwak 1  
,   Piotr Jabłoński 1  
,   Łukasz Furmański 1  
,   Paweł Grobelny 1  
,   Stanisław Legutko 1  
 
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Poznan University of Technology, Faculty of Mechanical Engineering and Management, 3 Piotrowo street, 60-965 Poznan, Poland
Publication date: 2016-12-01
 
Adv. Sci. Technol. Res. J. 2016; 10(32):53–58
 
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ABSTRACT
The paper presents the results of hardness tests of aluminum alloy AW-7075 (for plastic processing) and Ni-P chemical coatings (nickel-phosphorus) which had been applied by the no-current method. Coatings of various thickness have been made and their influence on the increase of the top layer hardness has been determined, as well as the increase of the hardness of the coating and substrate system after puncturing the coating with an indenter. The purpose of the investigation was to determine the possibility of applying the Ni-P coating for selected technical applications, among others, by the selection of its optimum thickness on the hard aluminum alloy and by the determination of the deformation resistance of the top layer if the given coating.