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  1. B

    Conclusions on Aluminum Adhesive Bonding Tests

    Sorry guys, I have been offline with some family medical issues for the last few months. Orion, I am a bit wary of a "wipe-on" primer for any adhesive. To be effective a primer must come in contact with a chemically active surface so it can react. I note that the proponent claims that the...
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    Conclusions on Aluminum Adhesive Bonding Tests

    Welcome back Malcolm W. Hope you enjoyed the trip. Thanks for the comments. I note the military experience. Several years ago I was involved in a program involving NADEP-NI which found that the chromic acid etch process (pasajel) would only work if the surface was heated above 140F. Down under...
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    Conclusions on Aluminum Adhesive Bonding Tests

    Fair call Orion. There are many processes out there which give initially sound structure but which fail in later service. Even from large manufacturers including the ones you mention. In many cases the field level repair procedures produce even worse results. However, it has been our experience...
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    Conclusions on Aluminum Adhesive Bonding Tests

    Steady guys. Just because you don't have the whiz bang gear it is no excuse for doing nothing at all or doing things we know are wrong. You can still produce durable bonds in a garage with minimal precautions and limited equipment. The idea of using rivets to prevent peel is in fact misplaced...
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    Conclusions on Aluminum Adhesive Bonding Tests

    Where do I start? Firstly Gary, it is not good practice to make a witches brew of different materials. For example you may well accidentally provide an over-abundance of one curing agent and end up with the other component being undercured. I'd urge extreme caution in arbitrarily modifying...
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    Conclusions on Aluminum Adhesive Bonding Tests

    Gary (and others) I noted the comment All that your dry southern Californian environment will do is to let your structure survive a little bit longer. I said that hydration is exacerbated by hot, wet environments. I did NOT say that the absence of such environments eliminates the problem. IT...
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    Conclusions on Aluminum Adhesive Bonding Tests

    Garry you wrote: I can assure you with absolute certainty that if you rely solely on scuff sand and solvent clean, you will eventually experience disbonding. You must use a process to develop resistance to hydration such as AC130, grit blast and silane or phosphoric acid anodising. Let me...
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    No paint on Carbon Fiber

    I have results from a scientific test conducted at a number of sites with full exposure, partial exposure and full protection, painted and unpainted AS4-3501-6 carbon/epoxy. The specimens were weighed daily for the first month and then weekly for the next few months and eventually monthly. The...
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    Conclusions on Aluminum Adhesive Bonding Tests

    Phenolics are good adhesives. The Fokker F27 used Redux bonding and never had problems and that was based ona phenolic adhesive system. The reason phenolics are not popoular is that they are condensation polymerisiers, compared to addition polymerisers. In addition polymerisiers part A plus...
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    Conclusions on Aluminum Adhesive Bonding Tests

    Hi Gary Sorry about the lengthy PPRuNe thread. I really wish I did have the time to filter it. Essentially much of what I said is in DOT/FAA/AR – TN06/07, Apr 2007 BEST PRACTICE IN ADHESIVE BONDED STRUCTURES AND REPAIRS which is available through the FAA Tech Center Library. I was the primary...
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    Conclusions on Aluminum Adhesive Bonding Tests

    bmcj, I can confirm that there are small mounds which occur at the areas where the weave passes over and under each strand. The resin rich area there fractures leaving a rough surface which actually does bond because you expose a chemically active surface by fracturing the resin. The...
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    Conclusions on Aluminum Adhesive Bonding Tests

    With reference to the peel ply issue. We found out about this when we could not get strain gauges to stick to a composite specimen. Examination under SEM found extensive contamination with silicone. We then examined composite patches made with the same peel ply and found the bonding surface...
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    Conclusions on Aluminum Adhesive Bonding Tests

    Guys I am the "blakmax" referred to in the last posting. I have signed in because I was alerted to your forum. Please read the AW139 reference above, because the test methods you are using give you a false sense of security which is unwarranted. Please do NOT ever rely on just an abrade and...
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