1. Introduction
Nontraditional machining processes are extensively employed to produce geometrically complex and precision parts from engineering materials in industries as diverse as aerospace, electronics and automotive manufacturing [1,2] There are many multiple geometrically designed precision parts, such as deep internal cavities, miniaturized microelectronics and fine quality components may only be manufactured by nontraditional machining processes [3,4]
Chemical machining is a well known nontraditional machining process is the controlled chemical dissolution of the machined workpiece material by contact with a strong acidic or alkaline chemical reagent, Special coatings called maskants protect areas from which the metal is not to be removed. The process is used to produce pockets and contours and to remove materials from parts having a high strength-to-weight ratio. Moreover, the machining mehod is widely used to produce micro-components for various industrial applications such as microelectromechanical systems (MEMS) and semiconductor industries [5,6]