Anodising of aluminium and its alloys in conventional anodising electrolytes such as sulphuric, oxalic, chromic and phosphoric acid to get the required physical properties for desired applications are well known. Anodising in organic acids was also investigated in the past. Hard anodising at ambient temperatute to get thick, Hard and wear resistant coating on alluminium alloys using sulphamic acid which is one such promising electrolyte. This electrolyte system has been selected due to lesser aggressive power and abiility to produce more compact oxide film on alluminium alloys. So a systematic investigation has been carried out and the physical properties of the oxide film produced under various operations conditions are measured. The effect of concentration, temperature, current density and addition agents on the quality of the oxide film are reported and the results are discussed
