CORROSION FORMS AND DEF.ECTS.

The research  in prevention of anti corrosion in maintenance and control of industrial facility, Robert et al, discussed on different types of corrosion and emphasied, that a uniform corrosion is characterised by a literally constant speed of corrosion. typical examples are given by the atmospheric corrosion of galvanised steels - the thicker the zinc coating, the longer the service life or the chalking of paint, which are degraded uniformly by radioactive oxidation in air.Erosion corrosion, uniform corrosion may proceed faster when there is a flow. the flow rate velocity will locally reach high value if turbulent situation occurs, which will prevent the formulation of protective layer on the metals. Abrasive practice in a stream of gas or liquid may mechanically distrupt  the protective surface film and thus enhance corrosion often in a non uniform, localized way.
cavitation  corrosion implies formulation and collapse of tiny gas bundle in a liquid stream, which implies that it can mechanically destroy any protective layer, causing localized corrosion, erosion and cavitation corrosion are control by proper design selection of materials and may help in special case. Galvanic  corrosion often occurs when two different materials are in contact etc.