3.4. Corrosion resistance of typical layer after different surface preparation
The tests in the salt chamber confirmed the results of the previous tests. It was shown that the use of vibro-abrasive machining is the most effective surface preparation method. Corrosion resistance of the elements with the coatings deposited on the surfaces vibro-abrasively machined is much higher than that of the coatings deposited on the surfaces ground and polished. It is a result of minimizing the influence of casting defects and reducing the number of potential penetration areas of salt mist (Fig. 4). In spite of the obviously better results for vibro-abrasive machining, the galvanic coatings on the magnesium alloys have not met acceptance criteria connected with corrosion resistance in the salt mist yet.