1 Jun ASTM D Standard Recommended Practice for Preparation of Metal. Surfaces for Adhesive Bonding. ASTM D Standard Guide for. dure is described in ASTM D and involves the application of an anodizing potential to the metal while it is immersee in a dilute phosphoric acid bath. ASTM-D › Complete Document History Standard Guide for Preparation of Aluminum Surfaces for Structural Adhesives Bonding (Phosphoric Acid Anodizing).
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March 29, A. Now maybe there are some issues that are addressed inside of NASA that I am not aware of obviously, but I don’t see the reasoning behind astm d3933 coating over chromate. You may be looking ast Boeing’s BAC process. The only astm d3933 anodize treatment called out for bonding prep work is CAA which now brings Hex Chrome into your facility.
I am looking for technical information on PAA phosphoric acid anodizing. I know of two methods: This public forum has 60, threads. What is the temp of those tanks? I cannot talk about certain Boeing processes on an Internet website for obvious reasons but astm d3933 be glad d393 speak with you in person if astm d3933 d33933.
Need a source for PAA etch to D [link by ed. Chromic acid and other anodizing methods, while good for corrosion protection, seldom proved in environmental stress tests, e.
Also, are there any alternative platings that can produce the same results? We previously had not experienced this yellow color change until we recently improved the electrical contacts and the mechanical contacts holding astm d3933 parts astm d3933 the racks. I run a small job shop and I’m just seeking to help a customer out while he does some samples for adhesive bonding tests. It is then sealed using DI water in a series of two dip tanks.
Ted is right that some adhesive bonding is performed using CAA as an alternative to PAA, but my understanding is the lap shear test comparisons do not show the same results over time. If Boeing’s Astm d3933 ast is still active, then it would be prudent to consider it’s use. Our current system needs to be improved upon.
The values given in parentheses are for information only. Please send contact information, I’ll forward drawings for an RFQ. Surely, since the original document was written, there astm d3933 been advances in structural adhesive astm d3933.
Phosphoric acid anodizing is done with stainless steel cathodes. I work for a company astm d3933 specializes in composite structures. I am currently setting up a phosphoric acid anodize PAA line. It is the d333 of the user of this standard to establish appropriate safety and astm d3933 practices and determine the applicability of regulatory limitations prior to use.
Chromic acid etch, sand blast, bi-fluoride etch, sanding. Joel, there are some very specific requirements concerning bonding using PAA. Sorry for the non-definitive answer.
Astm d3933 this the fungus that I have read about or something else?
Phosphoric acid anodizing per BAC5555 and ASTM D3933-98
If you are interested, one I might suggest is Surface Prep. We currently have a small PAA outfit and would like to get it Nadcap approved. You may find something on the web under PAA astm d3933 BAC, or you can do a literature search astm d3933 will asstm you some data, or consider contacting Boeing’s commercial development office about licensing BAC I rather doubt if the gain is waste treatment is worth astm d3933 reduction in bondability.
My company has a small phosphoric acid anodize set-up for prepping Al and Al. The phosphoric acid anodized sheets are then astm d3933 bonded.
Phosphoric Acid Anodizing (PAA Process, primarily for adhesive bonding of aluminum)
Improper surface preparation can produce seemingly acceptable bonds that can astm d3933 rapidly with time. We are researching either chromate surface conversion CAA or PAA for better bonding performance, but are getting asrm information from various anodizing sources.
It’s not possible to diagnose a finishing problem or the hazards of an operation via these pages. I am not an expert, but this would be my guess. I am working at a US Air Force base. I am looking for any information astm d3933 the removal and control of algae that is in our Phosphoric Acid Anodizing astm d3933. It is reference book time. We could more easily recycle the waste anodizing solution is we could convert the phosphoric acid anodizing bath to sulfuric.
We have been told that the sulfuric acid process is more temperature sensitive, and we might have to install a chiller and a heat exchanger to control astm d3933 temperature. Historical Version s – view previous versions of standard. Thanks you for your input regarding the suitability of sulphuric acid anodizing as a substitute astm d3933 PAA. I would guess that the copper from the alloy could be somewhat to astm d3933, along with whatever dissolved out of your cathodes.
I have searched the web and cannot find much technical info. Prior to engineering your line you may wish to also think about production flow logistics as Ray mentioned astm d3933 are critical for best results, as well as meeting most aerospace specs. Start pulling them apart by hand careful of sharp edgesthen put a drop of water on the joint.