Abstract
The potential value of arc and flame spraying as a method for corrosion protection was the background for the present work, which was initiated at the beginning of 1969. The more important properties of arc and flame sprayed aluminium and zinc coatings were investigated.
The measurement of bond strength is of particular importance. For this it was necessary to develop a reliable measuring method which could be applied to coatings thinner than 0·4 mm. Using this method, the bond strength of arc sprayed aluminium coatings was determined as a function of various spraying parameters. Roughness, structure and hardness of these coatings weare also investigated in relation to the same parameters, and some comparison was made with corresponding results obtained by arc spraying of zinc and flame spraying of aluminium and zinc.
More important from a practical point of view is the very strong relationship that was revealed between the quality of surface preparation and the bond strength, emphasizing the importance of paying more attention to practical methods for controlling the quality of blasted steel surfaces.
It has been shown that arc and flame sprayed zinc as well as flame sprayed aluminium demand a first class quality of grit or sand blasting in order to obtain the required bond strength. Arc spraying of aluminium, however, gives good bond strength values even with considerably inferior blasting. This gives the latter process economic advantages.
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