The Effect of Corrosion Wear on the Recorded Texture of a Clad Al-Si Coating
An AlSi7,5 clad coating applied one-sided on metal sheet of AlMn1Cu alloy was tested. The coating was made in hot clad rolling process.
The coating was subjected to X-ray diffraction measurements paying attention to texturing. Pole figures were recorded for reflections (111), (220), (311) and (331) from the αAl solid solution. The texture measurements were taken before and after the corrosion test. The coatings were subjected to salt spray corrosion tests (according to the PN-EN-ISO-9227:2007 standard) in three cycles of 6hrs, 12hrs and 18hrs, respectively. Comparison of the state of the surface and the sub-surface structure was also made in macro- and microscopic examinations. It was demonstrated that the corrosion attack had the character of pits and covered only half of the coating. The preferential places of pit initiation were matrix-silicon crystal interfaces. The first corrosion changes occurred after 1 hr of test. After 18 hrs of test, the corrosion attack had encompassed considerable surface areas of the clad coatings. The mass loss of coatings after 18 hrs of test amounted to 0.2%.
It was concluded that corrosion has little influence on changing the texture of coatings. Additionally, GIXRD measurements showed change of structure at the layer depth.
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