Cadmium Substitution - garteur

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GARTEUR LIMITED B.3.3 Coating Adhesion The coating adhesion on the grit blasted steel substrate was good. The metallic coatings behave in a brittle manner (except ED cadmium) resulting in a high crack density at a plastic strain of 1%. At increasing strain no signs of coating delamination were observed. Tests conducted on Delta-tone indicated that the surface roughness is a critical factor in determining the coating adhesion. A smooth surface was found to give the best adhesion. If the surface roughness is too high, a micro-layer of Delta-tone prevents complete wetting of the surface and cavities are formed at the coating/steel substrate interface. B.4 Conclusions 1. The microstructures, thicknesses and compositions of the coatings supplied for the Garteur programme have been compared with information given by the coating producers and with data published in the open literature. It is concluded that coatings are representative of those generally used in the aerospace and other manufacturing industries. 2. Resistance measurements indicate that it is possible to achieve good electrical conductivity with both coated Hi-Lok and coated countersink screws. Tests made on simple aluminium alloy lap joints indicate that there is electrical contact between the fasteners and aluminium alloy. 3. All the metal coatings investigated showed good adhesion to steel substrates which had been grit blasted. Tests made on the Delta-tone coating indicated that the best adhesion was achieved when the substrate was smooth. B.5 References [B1] W.G.J. t Hart and J.A.M Boogers, “Coatings considered for cadmium substitution (Garteur AG17 Programme), NLR CR 97107 L (1997) Page 50 GARTEUR SM/AG17 TP128
GARTEUR LIMITED B.6 Tables Coating Element (concentration – wt%) Al Cd Co Cr Fe Mg Ni P Ti Zn ED <strong>Cadmium</strong> 100 ED Zinc-Nickel 9.9 90.1 ED Zinc-Cobalt-Iron 0.8 t 99.2 Delta-tone 2.2 3.1 5.4 83.6 PVD Aluminium 100 ED Aluminium 100 UBMS Aluminium- 90 10 Magnesium SerMetel 984 90 5 5 Table B1; Chemical composition of Garteur coatings Coating Eddy Current Range (μm) Average (μm) Optical X-section (μm) ED <strong>Cadmium</strong> 20-28 22.5 15-20 ED Zinc-Nickel 13-17 15.2 5-10 ED Zinc-Cobalt-Iron 16-19 17.9 10 Delta-tone 17-32 24.5 10-15 PVD Aluminium 18-23 21.1 ED Aluminium 12-16 14.4 UBMS Aluminium-Magnesium 7-12 9.6 SermeTel 984 32-48 39.4 35 Table B2; Coating thickness measurements GARTEUR SM/AG17 TP128 Page 51
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GARTEUR LIMITED This page is intent
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GARTEUR LIMITED Executive summary B
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GARTEUR LIMITED nickel coatings cou
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GARTEUR LIMITED Page 9 Recommendati
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GARTEUR LIMITED G.1 Introduction 89
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Page 38 and 39: GARTEUR LIMITED Coating Thickness
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Page 48 and 49: GARTEUR LIMITED Properties ED Zn-Co
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Page 66 and 67: GARTEUR LIMITED Type A Measurements
Page 68 and 69: GARTEUR LIMITED B.7 Figures Hi - Lo
Page 70 and 71: GARTEUR LIMITED ED Cadmium IVD Alum
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GARTEUR LIMITED I.7 Tables Coating
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GARTEUR LIMITED I.8 Figures Cadmium
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GARTEUR LIMITED Cadmium coated bolt
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GARTEUR LIMITED cadmium although it
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GARTEUR LIMITED Garteur main coatin
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GARTEUR LIMITED D-28183 Bremen, GER
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Cadmium Substitution - garteur

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