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99296 EVALUATING Zn, Al & Al-Zn COATINGS ON CARBON STEEL IN A SPECIAL ATMOSPHERE

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Product Number: 51300-99296-SG
ISBN: 99296 1999 CP
Author: O. Troconis de Rincon, A. Rincon, M. Sanchez,
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This paper presents a comparative evaluation of Al, Zn and Al-Zn coatings on carbon steel exposed to a coastal-marine atmosphere. It is a very aggesive atmosphere with high wind velocities (corrosion-erosion rate = 1.4 mm/year for ASTM 1029 steel). A metallized zinc coating with a pore sealer was also evaluated. IS0 and ASTM standards were used for the evaluation. Afler a two-year exposure the best performance was achieved by the Al and Al rich alloy (85% Al-15%Zn) with some damage of the coatings. But the Zn metallized coating, with a pore sealer, did not show signs of damage. Keywords: Zn, Al & Al-Zn coatings, carbon steel, atmospheric corrosion
This paper presents a comparative evaluation of Al, Zn and Al-Zn coatings on carbon steel exposed to a coastal-marine atmosphere. It is a very aggesive atmosphere with high wind velocities (corrosion-erosion rate = 1.4 mm/year for ASTM 1029 steel). A metallized zinc coating with a pore sealer was also evaluated. IS0 and ASTM standards were used for the evaluation. Afler a two-year exposure the best performance was achieved by the Al and Al rich alloy (85% Al-15%Zn) with some damage of the coatings. But the Zn metallized coating, with a pore sealer, did not show signs of damage. Keywords: Zn, Al & Al-Zn coatings, carbon steel, atmospheric corrosion
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