Machineries corrosion and protection

Author.The phenomena of corrosion in acquiring increasing attention due to wear of friction parts in machines that will lead to loss of efficiency of these parts and decrease of the quality of the products in addition to the threat to industrial security beside massive power consumption used to operate these parts and machines. Some 30% of the national income in developed countries is wasted in replacement and maintenance of corroded parts in machines in spite of massive efforts to control this important economic issue. These parts will discuss the topic of corrosion in machines, types and causes, the methods to control and protection. There are lots of ways to confront and protect machines from corrosion of which: To depend on lubrication through injecting oil under definite pressure to reach friction parts, this can be managed more easily by supplying contact surfaces with holes for oil to reach the area of contact. Through selection of highly resistant metals for corrosion and highly resistant for high temperature solid and durable metals. To resort to know thermal treatment as to form hard surface layer to bear the applied load through nitrogen case hardening and carbonization or sulphurization. To depend on optimum design for friction parts as to lessen the friction factor, in using ball bearing instead of slide bearing in this field. To use surface membranes that adhere to the surface of solid body to protect this surface and to bear friction, in this way it will erode and be replaced; thickness of this layer ranges between few microns and millimeters, like those layers produced through expulsive painting, chemical reaction, or through magnetic fields wrapping or wrapping using titanium azotic layer through employment for plasma current