The sample color is measured and the results can be expressed on the L, a, b or x, y, z scales. Click and Receive a quote within the next 4 hours. Indeed the sample texture, may affect the correlation between the magnitude of a measured color difference and its commercial acceptability. Typically two color scales are used for color measurement: tristimulus X, Y, Z or the L, a, b scale.

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Good luck stephen clark - weatherford, Texas -- this entry appended to this thread by editor in lieu of spawning a duplicative thread Q. I am trying out Phosphoric Acid anodizing for a new customer. Can you help me with a process for Phosphoric acid anodizing. My customer requires this process as they need to go for another bonding process. Thank you, Johnny Goh - Singapore Ed. I have just quoted a large phosphoric anodize job. My main question is what is the recommended cathode material for this chemistry?

Thank you in advance for your help. Best Regards. Rick Richardson, M. Dayton, Ohio A. Phosphoric acid anodizing is done with stainless steel cathodes. If the anodizing tank is stainless steel, the tank itself can be the cathode. Phosphoric acid anodizing is usually requested by the aerospace industry.

It is used as a surface preparation for bonding. There are very stringent requirements for application and inspection of phosphoric acid anodized parts [for aerospace application].

Usually the customer requires a certification before parts can be processed. If you have further questions, please feel free to follow up. Ray Handwerker - Bensalem, Pennsylvania -- this entry appended to this thread by editor in lieu of spawning a duplicative thread Q. People in our composites group are pushing the electroplating facility to install a phosphoric anodizing process to prep aluminum for adhesive bonding.

Can anyone tell me what equipment is needed to phosphoric anodize aluminum? I need info like tank liners, cathode material, voltage and amp requirements, bath temp, etc. Thank you in advance. Hi Joel. We appended your question to a thread which should answer many of your questions without having to wait for replies. Phosphoric acid anodizing PAA is used to give aluminum a good tooth for adhesive bonding. See D [affil. Ted Mooney, P. Striving to live Aloha A.

I am currently setting up a phosphoric acid anodize PAA line. PAA is used to prepare the aluminum surface for acceptance of the primer before bonding. You should note that PAA specifications call for the anodized parts to be stored in a "clean room" environment prior to application of the primer.

Parts must be transferred to the clean room within two hours of removal from the PAA line and be primed within 72 hours.

After priming, parts can be stored before bonding. Specifications you might want to obtain for reference include: Boeing BAC


Phosphoric acid anodizing per BAC5555 and ASTM D3933-98, p.2

Moogujar The spec can be obtained from Boeing commercial division or from some specification clearing houses like aerospheres. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. In either case, these guides can be leveraged as a springboard to a productive discussion with an adhesives supplier. Can you help me with a process for Phosphoric acid anodizing. Phosphoric Acid Anodizing PAA Process, primarily for adhesive bonding of aluminum Your comments will receive careful consideration at a meeting of f responsible technical committee, which you may attend. The main office, downtown, used to have one of the finest libraries going. Reviewing this guide brings perspective not only to the product under development, but also any necessary testing.


ASTM D2244

Can sulfuric acid anodizing be substituted for PAA Q. I am working at a US Air Force base. It uses sulfuric acid anodizing at many sites, and has a phosphoric acid anodizing operation in one building. It is then sealed using DI water in a series of two dip tanks. The phosphoric acid anodized sheets are then pressure bonded. Can this operation be switch to sulfuric acid anodizing?


ASTM D3933 - 98(2017)



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