Chemical machining of nickel in ferric chloride solution

摘要: Chemical machining is a method of removing an unmasked area from metal surface by controlled selective dissolution with chemical reagents. This process used in the production machine and electronic parts also called etching or system. milling. Sometimes current applied at low density as assist. Many detailed studies have been 101 conducted recently to investigate nickel alloys [1-3]. Nickel highly resistant variety corrosive media, due passive film that it forms on its surface. Moon v Nobe [4] reported rates 1 0 increase concentration chloride ions E increased. Chevalet Zutic [5] proposed reaction mechanism solution. The purpose this study was ~ol behaviour ferric solu._c tions over temperature range 15-50°C. ~ 10 -1 experiments were gravimetric "' method. Low densities enhance rate FeC13 solution study. specimens prepared for tests 99.99% purity sheet (0.5 m x 2.5 cm x2 .hc m) . polished 1000-grade silicon carbide paper, cleaned acetone dried. then immersion tests. For measurement rates, 1000ml t01 solutions constant-temperature water bath (+ 0.5 °C) 15-50 °C. Weighed totally 4" immersed period h end which they removed, rinsed 10% sulphuric acid followed distilled acetone, dried reweighed. accelerated specimens, Nichia model G1001ED galvanostat o, apply constant anodic .E enickel. Current 0.01-0.1 Acm -2 chosen compare results good reproducible obtained. Results test 0.1 1.0 M 26 °C are shown Fig. 1. It clear increases exponentially concentration. containing