Improved rivet and coating technique

B - Operations – Transporting – 23 – P

Patent

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Details

B23P 11/02 (2006.01) B05D 3/02 (2006.01) B21K 1/44 (2006.01) B32B 15/08 (2006.01) F16B 19/08 (2006.01)

Patent

CA 2550444

A previously heat treated aluminum alloy rivet is sand blasted with aluminum oxide, washed with a corrosion resistant solution, dried, and then a coating is applied to the rivet. The coating includes solvent, resin, plasticizer and a corrosion inhibitor. The coating is cured at an elevated temperature below 300~F, preferably in the order of 250~F for about an hour, or between one-half and one and one-half hours. The resultant rivet has a relative thick gasket- like coating about 0.0007 to about 0.001 or 0.002 inch thick, and retains its high shear strength resulting from the initial pre-coating heat treatment. As an alternative pre-treatment, the rivets may be chromic acid anodized.

L'invention concerne un rivet en alliage d'aluminium traité thermiquement au préalable, qui est sablé avec de l'oxyde d'aluminium, puis lavé avec une solution résistant à la corrosion, séché, avant application d'un revêtement audit rivet. Le revêtement comprend un solvant, une résine, un plastifiant et un inhibiteur de corrosion. Le revêtement est cuit à une température élevée inférieure à 300 ·F, de préférence de l'ordre de 250 ·F, pendant approximativement une heure, ou entre une demi-heure et une heure et demie. Le rivet qui en résulte présente un revêtement de type garniture relativement épaisse, de l'ordre d'approximativement 0,0007 à approximativement 0,001 ou 0,002 pouce d'épaisseur, et conserve sa résistance élevée au cisaillement, résultant du traitement thermique de prérevêtement initial. Un autre traitement préalable consiste à anodiser les rivets à l'acide chromique.

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