Adhesive Bonded Steel:Bond Durability as Related to Selected Surface Treatments.

摘要

High-strength 4340 carbon steel single lap-shear coupons were treated with four selected surface preparations: (1) wire brush, (2) sodium metasilicate/ Triton X-200 solution, (3) phosphoric acid/ethanol solution, and (4) potassium iodide/phosphoric acid (iodophosphate) solution. Bonded joints were made with all four surface preparations using 3M's EC 2214 epoxy and B. F. Goodrich's TAME 200 acrylic adhesive. The joints were subjected to lap shear strength-control testing at 23 C and 60 C, then to hot water soak at 60 C for 100, 500, and 1,000 hours followed by testing at 60 C and stressed durability at 60 C and 95% RH until failure. Results indicate only slight differences in control test results for the different surface treatments using EC 2214, but very large differences using TAME 200. Durability of joints using both adhesives clearly favors the iodophospate and phosphoric acid/ethanol treatments. (Author)