Cadmium Substitution - garteur

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GARTEUR LIMITED F.6 Figures Figure F1; Summary of slow bend test data for electrodeposited aluminium and SermeTel coatings Page 88 GARTEUR SM/AG17 TP128
GARTEUR LIMITED ANNEX G Resistance to aircraft chemicals G.1 Introduction During an aircraft's operational life it comes into contact with a large number of chemicals and fluids. These include aviation fuel, engine oils and hydraulic fluids as well as cleaners and paint strippers used in the maintenance and repair of protective treatments. The aim of the work described below was to establish whether any of the cadmium replacements being investigated were likely to degrade on prolonged contact with some of the commonly used aircraft chemicals. G.2 Test procedures Studies of the resistance of replacement coatings to aircraft fluids were carried out by British Aerospace and Shorts. Details of the fluids examined by each of the organisations are given in table G1. G.2.1 British Aerospace All specimens were subjected to immersion in the above fluids for a period of 7 days. Following immersion the panels except for the water and Propanol were wiped clean with a clean cloth moistened with Petroleum spirit and left to dry. The remaining panels were wiped with a dry clean cloth. On completion of above the panels were visually assessed using x10 magnification before carrying out microscopic evaluation using an optical microscope. G.2.2 Shorts G.3 Results Coated panels 100 x 150mm were immersed in the various fluids identified in table G1. The panels were inspected daily for signs of corrosion attack, coating removal and colour changes. Tables G2 and G3 summarise the results obtained from the B.Ae and Shorts studies. Several of the coatings investigated, including electrodeposited cadmium, were found to be susceptible to corrosion attack when in contact with the aircraft cleaner Turco 5948. For ED Zn/Ni (passivated and non-passivated) the cleaner starts to remove the coating within 24 hours whilst for ED <strong>Cadmium</strong> (passivated and non-passivated) some attack is apparent after 500h immersion. Data presented in table G3 further indicate that Skydrol has a detrimental on both electrodeposited cadmium and zinc-cobalt-iron coatings. In each case a significant weight loss was recorded. G.4 Conclusions Most of the replacement coatings examined failed to show any significant degradation on exposure to a range of chemicals used on aircraft. Exceptions were ED zinc-nickel coatings in contact with Turco 5948 and ED zinc-cobalt coatings immersed in Skydrol hydraulic fluid. <strong>Cadmium</strong> plating was also found to be degraded by these fluids. G.5 Tables GARTEUR SM/AG17 TP128 Page 89
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GARTEUR LIMITED Executive summary B
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GARTEUR LIMITED nickel coatings cou
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GARTEUR LIMITED G.1 Introduction 89
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GARTEUR LIMITED The various aims of
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GARTEUR LIMITED 3 Summary of work p
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GARTEUR LIMITED The adhesion of con
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GARTEUR LIMITED properties and sacr
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GARTEUR LIMITED Outdoor exposure tr
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GARTEUR LIMITED torques of 7 and 17
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GARTEUR LIMITED 5.3 Conclusions The
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GARTEUR LIMITED 7 Discussion In the
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GARTEUR LIMITED 9 Recommendations T
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GARTEUR LIMITED 11 Tables Coating t
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GARTEUR LIMITED Coating Thickness
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GARTEUR LIMITED As - plated Passiva
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GARTEUR LIMITED As plated Passivate
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GARTEUR LIMITED Coating Potential r
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GARTEUR LIMITED Coating Potential c
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GARTEUR LIMITED Properties ED Zn-Co
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GARTEUR LIMITED Figure 3; Protectio
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Page 56 and 57: GARTEUR LIMITED A.4 Tables Coating
Page 58 and 59: GARTEUR LIMITED 1 Abrasive blast us
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Page 62 and 63: GARTEUR LIMITED Type A: Type B: ele
Page 64 and 65: GARTEUR LIMITED B.3.3 Coating Adhes
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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Page 74 and 75: GARTEUR LIMITED c) Exposure to 100%
Page 76 and 77: GARTEUR LIMITED [C7] Baldwin K.R.,
Page 78 and 79: GARTEUR LIMITED Coating rust (hours
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Page 82 and 83: GARTEUR LIMITED DBAA DERA NLR NLR B
Page 84 and 85: GARTEUR LIMITED C.7 Figures Figure
Page 86 and 87: GARTEUR LIMITED D.3 Results and dis
Page 88 and 89: GARTEUR LIMITED D.6 Tables Time hou
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Page 92 and 93: GARTEUR LIMITED Figure D4; Current
Page 94 and 95: GARTEUR LIMITED E.3 Results and dis
Page 96 and 97: GARTEUR LIMITED E.6 Tables Laborato
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Page 112 and 113: GARTEUR LIMITED Additional data obt
Page 114 and 115: GARTEUR LIMITED I.7 Tables Coating
Page 116 and 117: GARTEUR LIMITED I.8 Figures Cadmium
Page 118 and 119: GARTEUR LIMITED Cadmium coated bolt
Page 120 and 121: GARTEUR LIMITED cadmium although it
Page 122 and 123: GARTEUR LIMITED Garteur main coatin
Page 126 and 127: GARTEUR LIMITED D-28183 Bremen, GER
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Cadmium Substitution - garteur

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