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Analysis of depth of the microporosity in a nickel–chromium system alloy – effects of electrolytic, chemical and sandblasting etching
Author(s) -
Neto H. G.,
Cândido M. S. M.,
Júnior A. L. R.,
Garcia P. P. N. S.
Publication year - 2003
Publication title -
journal of oral rehabilitation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 93
eISSN - 1365-2842
pISSN - 0305-182X
DOI - 10.1046/j.1365-2842.2003.01102.x
Subject(s) - etching (microfabrication) , materials science , alloy , isotropic etching , nickel , porosity , metallurgy , chromium , electrolyte , nitric acid , metal , mineralogy , composite material , layer (electronics) , chemistry , electrode
summary The present study was designed to analyse the average depth of the microporosity of a nickel–chromium (Ni–Cr) system alloy (Verabond II). The metal surface was subject to one of the following surface treatment: (i) Electrolytic etching in nitric acid 0·5 N at a current density of 250 mA cm −2 ; (ii) chemical etching with CG‐Etch etchant; and (iii) Sandblasting with alumina particles 50 μm. Half of the samples were polished before the surface treatments. The depth of porosity was measured through photomicrographs (500×) with a profilometer, and the data were statistically analysed using an analysis of variance ( anova ) followed by Tukey's test. The conclusions were (i) Differents surface treatment of the Ni–Cr system alloy lead to different depths of microporosity; (ii) The greatest depth of porosity was observed in non‐polished alloy; (iii) The greatest and identical depth of microporosity was observed following electrolytic etching and chemical etching; (iv) The least and identical depth of microporosity was observed with chemical etching and sandblasting with alumina particles 50 μm, and (v) Chemical etching showed an intermediary depth.