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The most important factor, IMO, in coating performance is the quality of the surface preparation and environmental conditions dutin coating application and cure. Perform a high quality surface prep, and you should be able to get 10 - 20 years of service. BUT, just try to convince the folks...

I took and passed the examination (both the Material Selection/Design and Corrosion Specialist) more than 10 years ago. I found the examination (and the lead-in requirements) to be basically equivalent to a PE examination (which I passed almost 30 years ago). Is it useful? Hard to tell. I...

I echo ed's comment above, with my rewording: must ensure all materials are galvanically compatable, and if not IDENTICAL, then ensure the larger parts are slightly less noble compared to the smaller parts. As to materials, my experience starts with CuNi and bronze as a low end option...

For TVP: You're confusing PROOF load testing with YIELD testing (which, BTW, is the same arguement this supplier made). My question pertains to wedge tensile testing AFTER a speciman had been YIELD tested.

Regarding: "I have looked at various other bolt coatings claiming high corrosion resistant, i.e. Geomet, Dacromet, Ultra Corrosion Resistant etc. All of these have displayed images of 1000 hour salt spray tests indicating they far out perform hot dipped galvanized. I would have taken this to be...

I've a couple of fastener suppliers that are claiming it's technically acceptable to perform wedge tensile testing (IAW ASTM F606) on a fastener that had been previously yield tested (but not to failure, obviously). My position: yield testing of a fastener imparts at least limited work...

The only way you can get that type of corrosion from "stray currents" (assuming your boat/slip isn't a source for the stray current) is if there is a sufficient potential difference from location to location. If you have acccess to a "dip cell", you can take a "hull survey" around the boat and...

Back to the original posting from ZDAST04; The original posting reminded of two past experiences; both occured right before I retired from the military as was open to "ALL" opportunities: (1) An "AMWAY" rep mentioned a business opportunity he thought I would be interested in. Turned out it...

Galvanizing provides what is essntially a very thin sacrificial anode, with the emphasis on "very thin". The service life of sacrificial anodes (in this case - galvanizing) is determined (partly) by the mass of anode material. Since galvanizing provides a very thin layer, with little mass...

For salmon: The flanges we're questioning have already been welded into their applications, some have been in service for over 7 years. Any flanges not welded in place when the issue was identified were returned to the vendor. The issue isn't if the provided products meet our specs, (they...

Providing a little additional info (for grampi1 and others): We've already conducted a little testing on bar stock material; we had an independent inspection lab UT a sample of bar stock (don't recall the acceptance criteria off the top of my head, but "it passed"); and we also took a...

I’ve a situation where C-steel flanges to ASTM A105 are required to be manufactured from individual forgings; however, we’ve discovered (AFTER the fact, of course) that one vendor did not properly read our procurement documents and as a result we have flanges that were machined from either...

Several companies tried to market this BS to the US Navy several times over the past several decades. For numerous reasons, it's a non-starter. Bear in mind these points before you invest a dime: - what evidence is there that the frequency the equipment operates at works for a wide range of...

If you are tasked to evaluate the heat load, didn't the tasking contain parameters?

Almost nothing is "non-sparking". One company conducts tests to determine what kinetic energy (i.e. a fall from what height) can produce significant sparking, and designs/guidance are prepared accordingly.

Assuming this is a flow-through system, the best way to control corrosion is matarial selection. The best way to control fouling is material selection plus an injection of a biocide or film-forming material. Be aware, though, the environmentalists out there tend to oppose both. Some...

(1) You need to reaserch the requirements for your state. From personal experience, there are "minor details" that differ from state to state, except they aren't minor if they mean you may not be eligible to take the exam. (2) If you "just miss" the requirements, consider writing a letter and...

Do you know the alloy? If yes, the microstructure is probably also known. Also, the previous question [why do you need to know] seems valid, if nothing else to provide perspective.

I can only say - avoid mechanical fittings for CRES connections and seawater - you WILL see crevice corrosion, it's just a matter of statistics. I also need to ask [for curiosity] - is the vessel private, commercial, or Coast Guard?

is there a reson the customer wqants a ceramic coating?