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  1. boothuk

    ASTM G42

    Hi, Is there any reason why we should not use 2 seperate panels instead of one large on for this CDT test. Usually one panel will be immersed with holiday and the other half above the water source (vapour zone). We have been supplied with 2 panels (not big enough to immerse and have a...
  2. boothuk

    Paint adhesion 6061 vs 7075

    Wettability of the surface will generally increase with surface pre-treatment. (Acid / Alkaline etch, etc.) The alloys won't possess significant differences in adhesion as an untreated surface.
  3. boothuk

    Powdercoating Failures - Blistering

    Czeilenga, As per most failures that are related to powder coatings, the pre-treatment of the surface is generally the issue and should always be the first port of call. You indicate that the substrate was rusty prior to application. Is this the case? Have you used any chemical pre-treatment...
  4. boothuk

    Paint is Fading Looking for Test

    Jedward, I suppose the end use and type of paint used is feasible. Did you calculate the CIELAB or are you making a visual comparison? What was the gloss retention of the coating like? Apologies for being so dismissive, I have a tendancy to focus on the abilities of powder coatings only, as per...
  5. boothuk

    Alyeska Shear Stress test on HSS

    Has anyone ever done this test? If so, please could you forward a photograph of your set-up? Thank you. "The purpose of this test is to determine if the sleeve has adequate resistance to shear stresses that might result from friction between the coating and the ground during pipe movement. The...
  6. boothuk

    Paint is Fading Looking for Test

    Cervantis, are where are you based? Have you ever heard of 'Qualicoat'? This is an accepted standard in Europe & M.E. for architectural specifications. Some of the biggest manufacturers of PC are members, i.e. Jotun Powder Coatings UK/Thai/Dubai, Akzo Nobel Powder Coatings...
  7. boothuk

    RAL or BS Paint colour

    RAL 1002 Sand yellow RAL 1004 Golden yellow RAL 1003 Signal yellow RAL 1005 Honey yellow RAL 1007 Daffodil yellow RAL 1012 Lemon yellow RAL 1016 Sulfur yellow RAL 1018 Zinc yellow RAL 1020 Olive yellow RAL 1023 Traffic yellow RAL 1021 Rape yellow RAL 1017 Saffron yellow RAL 1032 Broom yellow RAL...
  8. boothuk

    Cupping test (ISO 1520)

    RobLN, What specification are you testing for this PC?
  9. boothuk

    Paint is Fading Looking for Test

    I seriously doubt that any coating would show no deterioration after 10k hours to Xenon Arc. I don't know your end use, but powder coatings (PE) show very good resistance to natural sunlight. I am referring to architectural grades. For future reference, you may check the 'fingerprint' of the...
  10. boothuk

    Salt spray test failure, no cause identified

    Perhap's you should check the cabinets you are running. Do you run an interval clean down on your SS cabinets? How about the purity of the NaCl your buying in? We use analytical grade to ensure no trace of copper is in the salt. You must check the fallout rate of fog, chamber air temp...
  11. boothuk

    Worm like defect in Electroless nickel plating

    Is the filiform corrosion evident at the aluminium interface, ali/plated interface or within the plating layer? Perhaps a microscopic image would help.
  12. boothuk

    Most feasible chemical for pH neutralisation of 3% salt solution

    Hello, I am a coating's technologist currently handling a huge throughput of cathodic disbondment testing (CDT). We are a UKAS approved laboratory for this test, i.e. we must maintain everything according to specification for the duration of the test. I am seeking suggestions for the most apt...

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