The book "Conversion Coatings on Aluminium" describing the various kinds of surface treatments, conversion coatings of aluminium and its alloys. Aluminium and its alloys have many kinds of composition and very difficult to optimize a certain pre-plating procedure that will be important for the industrial plating procedure. This is the out put of our original research work done in the laboratory (Advanced Materials Research Laboratory, Periyar University, Salem-636 011, Tamil Nadu, India). This book is very useful for the research scholars and students whoever are working in the field of composite/conversion coatings on aluminium.