To evaluate their use as alternatives to cadmium on bolts the properties of various coatings are examined. Judged by marine atmosphere exposure the corrosion resistance of the coated bolts varies from excellent (cadmium and zinc plate) to negligible; their galvanic compatibility with aluminium alloy shows similar variations. The results of laboratory tests to evaluate these corrosion characteristics conflict with the marine atmosphere tests. The measurement of the currents generated and weight losses which occur in galvanic cells between the bolts and aluminium alloy electrodes is shown to be a useful and very rapid screening test for galvanic compatibility. The uniformity of the coatings is established metallographically and various properties of the coatings examined include fluid resistance, paint adhesion properties, electrical conductivity and resistance to thermal shock. The effect of the coatings on the fatigue properties and torque-tension characteristics of the bolts are also assessed. (Wassmann)
An evaluation of coatings for steel and titanium alloy fasteners for aircraft applications
Eine Untersuchung der Beschichtungen von Verbindungselementen aus Stahl- und Titanlegierungen im Flugzeugbau
ADVANCED FABRICATION PROCESSES. AGARD-CONF. PROC. ; Sep ; 6-11
1978
11 Seiten, 7 Bilder, 9 Tabellen, 8 Quellen
Aufsatz (Konferenz)
Englisch
Emerald Group Publishing | 1963
Engineering Index Backfile | 1963
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