Amount of Corrosion X Needed

[RoundTwo]

How much Corrosion X is necessary for a full treatment in a J?

[PeteMc]

Sorry I can't help with specifics on the volume, but I do remember my mechanic split the cost of one "X" (can, bucket, box, whatever it comes in) between myself and a friend.  It was enough to do my K and his J and a better price break buying for two planes.

 

Edited September 23, 2023 by PeteMc

[LANCECASPER]

7 hours ago, RoundTwo said:

How much Corrosion X is necessary for a full treatment in a J?

Make sure that you completely seal your autopilot servos in plastic before spraying this or you'll be buying new servos.

[ArtVandelay]

Make sure that you completely seal your autopilot servos in plastic before spraying this or you'll be buying new servos.

Aren’t modern servos sealed, not to protect against corrosion X but moisture (rain)?

[LANCECASPER]

15 minutes ago, ArtVandelay said:

Aren’t modern servos sealed, not to protect against corrosion X but moisture (rain)?

This stuff seeps into any opening or crevice, no matter how small. It will be coming out of seams in the airplane for at least the next year.

If you feel comfortable spraying it and letting it hit servos and possibly seeping into them go right ahead. Personally I wouldn't for as easy it would be to protect them first. Corrosion X says you should avoid it also. 

https://www.corrosionx.com/pages/corrosionx-aviation-airframe-application

 

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[hammdo]

This pic I have shows just how CorrosionX, ACF 50, or BoeShield flows. This is 2 years after application (the long dark streaks). Heed @LANCECASPER advice. This stuff flows everywhere.

 

[DXB]

24 minutes ago, ArtVandelay said:

Aren’t modern servos sealed, not to protect against corrosion X but moisture (rain)?

Not sure how "modern" my STEC-30 pitch servo would be considered, but it was almost brand new when a certain MSC fogged my tail with Corrosion-X without protecting it.  Nothing could get it to work reliably for months (my avionics guy sees it often, he tried a couple of safe solvent sprays), and I was too stubborn to remove a new servo and send it back to be serviced.  I think ultimately the stuff wore off of it after several months, and it became reliable again.

[jetdriven]

It soaks into the clutch and messes that up. 

[ArtVandelay]

It soaks into the clutch and messes that up. 

GFC500 servos don’t have a clutch, don’t know about other modern AP models.

[larrynimmo]

With my plane, I only do the wings just outboard of the landing gear….i use the ACF-50….it only takes about 5 oz…the key is using 80 PSI and truly fogging the wings rather than spraying.

I do it every year at annual…rivets will smoke and there will be residue mainly on bottom of wings for the entire year

[tmo]

2 hours ago, ArtVandelay said:

GFC500 servos don’t have a clutch, don’t know about other modern AP models.

Are you sure? I've seen pictures of a G5 failing a GFC500 with an error saying: "Servo clutch fault".

I would think any servo would have to have some kind of clutch mechanism so the pilot flying can overpower it when things go too far south.

Testing for the ability to overpower a servo is, IIRC, part of pre-flight checks for the legacy King APs.

Edited September 24, 2023 by tmo

[LANCECASPER]

4 hours ago, ArtVandelay said:

GFC500 servos don’t have a clutch, don’t know about other modern AP models.

The GFC500 doesn't have a mechanical clutch, but unlike older servos they do have a microprocessor built in to electronically "slip" and handle other functions such as communicating back to the autopilot. I wouldn't want Corrosion X getting in to the electronics on the servo. The servos are brushless but definitely not hermetically sealed. But if you have something from Garmin that says that there is no need to protect them when fogging , and that it won't affect the warranty, please share it with us;.

[Pinecone]

FYI ACF-50 is perfectly safe for electronics.

I don't know if they still do it, but in the past, in their booth they would have an aquarium filled with ACF-50 and a small TV submerged and playing.

[A64Pilot]

2 hours ago, Pinecone said:

FYI ACF-50 is perfectly safe for electronics.

I don't know if they still do it, but in the past, in their booth they would have an aquarium filled with ACF-50 and a small TV submerged and playing.

I believe Corrosion-X is as well, we used it on the AH-64 for years and trust me our GA avionics are nothing compared to that and the boxes aren’t sealed as on the D model they sit on a shelf that has airconditioned airflow through the shelf and into the boxes. Called the “High Speed Machine Shelf” everything on the D model was either improved, high speed or integrated in its name, we used to joke about that. Boxes came apart pretty easy to replace cards so they definitely weren’t sealed.

However I’m sure it would wreck havoc with a clutch and your brake pads too as it’s pretty much green oil, or seems to have similar physical properties that oil does. Probably wouldn’t want it in a relay either and maybe the oil could cause arc damage over time?

My advice about using is don't if you think your going to be painting in the next year or two.

Corrosion -X I want to think is pretty much cans or a Gl with a gallon being about $150? A gallon is way more than you need if done right I assume 1 Qt would do the whole airplane, trick is getting what seems to be about 30W oil to fog and not spray, Army we had the special sprayers, but they were $$.

I think 1Gl would set you up for several years.

[Jsno]

For the areas that you can get to I would use acf50.  It dries hard.  Corrosion X needs to be misted on using the proper spray equipment.  It keeps flowing and wi drip out of every crack and crevice.  I have used corrosion X and found that it keeps flowing throughout it's life and ends up in all of the low areas and not on the upper and vertical surfaces.  Makes a gummy mess.  If you spray it with a spray bottle it will be too heavy.

 

[Pinecone]

I think you at thinking of BoeShield.  ACF-50 stay fluid.  I have seen reports of it still seeping years later.

[RoundTwo]

My bottle of Corrosion X arrived yesterday…

[tmo]

Once done applying, let us all know how much was enough

[1964-M20E]

Buy the gallon and keep it at the hangar use it year after year and for spot applications.  Also good for using on other things around the hangar.