FINALLY saw my first corrosion case yesterday.

[PBCounty]

Living in South Florida - there's a JL or JT at every stop light and plenty in every parking lot. I always look at hinges, hood, and tailgate for signs of corrosion. Until yesterday, I've not seen it once. I'd say that's a pretty good sign. Yesterday however I saw my first, and it was the hood hinges. It was a black JL and the hood hinges were all bubbled to hell, and quite badly. I checked out the rest of the Jeep and all was fine. Anyway, just sharing, that after lots of inspection, this is the first I've seen.

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[UTDieselRubi]

It will show, be patient... the factory mounted the hinges, then painted. Aluminum on steel always leads to corrosion.

 

[ShadowsPapa]

It will show, be patient... the factory mounted the hinges, then painted. Aluminum on steel always leads to corrosion.

As has been stated in several other threads - the hinges are not steel.

This is not galvanic corrosion.

The door hinges, the hood hinges - NOT steel.

If they were steel, and if it was galvanic corrosion, the problem would be where they meet, and it requires water.

I've only seen it on one Jeep myself - none of mine/ours have had the problem.

The only parts of the hinges that are steel based are the parts mounted on the cowl and the door frame.
The parts mounted on the door skin and the hood itself - apparently a magnesium or aluminum alloy.

 

[UTDieselRubi]

As has been stated in several other threads - the hinges are not steel.

This is not galvanic corrosion.

The door hinges, the hood hinges - NOT steel.

If they were steel, and if it was galvanic corrosion, the problem would be where they meet, and it requires water.

I've only seen it on one Jeep myself - none of mine/ours have had the problem.

The only parts of the hinges that are steel based are the parts mounted on the cowl and the door frame.
The parts mounted on the door skin and the hood itself - apparently a magnesium or aluminum alloy.

Well I won't go dig those posts up, but I do believe the hinges are not aluminum. They are getting galvanized corrosion via dissimilar metals regardless if they are not 100% steel. Most of the corrosion starts on or near the hinges. The surfaces aren't painted under the mating surfaces from what I have seen. An insanely high amount of these jeeps have the issue, thats why the TSB is to replace the hood, all doors and tailgate and the corrosion warranty is 5 years unlimited miles. Happened to mine at only 27k miles.

 

[ShadowsPapa]

Well I won't go dig those posts up, but I do believe the hinges are not aluminum. They are getting galvanized corrosion via dissimilar metals regardless if they are not 100% steel. Most of the corrosion starts on or near the hinges. The surfaces aren't painted under the mating surfaces from what I have seen. An insanely high amount of these jeeps have the issue, thats why the TSB is to replace the hood, all doors and tailgate and the corrosion warranty is 5 years unlimited miles. Happened to mine at only 27k miles.

Yeah, you need to go look them up. There's no steel to these hinges.
I know they are mounted before painting. Old topic. And I also know they were trying to fight it with some zinc shims (likely won't help)
Galvanic corrosion is something I know of and deal with in my work with various metals, plating and restoration.

If there was steel in the hinge, then it would not corrode, only the aluminum would - the door skin.
So there goes that.
Galvanic corrosion is most likely to occur at the interface

In the example of a steel fastener and aluminum alloy in the presence of an electrolyte, the aluminum acts as the anode and corrodes while the steel fastener remains protected - it does not.
So if the hinge had steel - it wouldn't corrode, the aluminum that is against the steel would. Hmmm, that lets out the hinge having steel since it's often what bubbles first.

Science, not what's repeated on the internet.

From the internet if you choose -
Galvanic corrosion is most likely to occur at the interface of a steel fastener and aluminum alloy inspection plate in the presence of an electrolyte.

At the interface. The aluminum would go first. So if the hinge was steel - why would there be bubbling in the middle of it and not on the aluminum at the joint between the two.
It's an electrical action, ion exchange. They must be electrically connected, and it's at the junction where things start.

Also - if the hinge body is aluminum - it can't possibly contain steel - the two can't be an alloy.
Magnesium and steel can be - but it's not common.
I have extremely strong rare earth magnets here and there's zero reaction to the hinges - not even a little bit.

 

[OldButStillJeeping]

 

[JBerd81]

My 2020 Sport S just started to show corrosion this spring.. only on the door hinges, I’ll get some photos today. I tried asking my dealership about it, and how long after the warranty is out, will they fix it, and the kid played dumb with me

 

[Bananaman]

I've got some on the bottom of my tailgate. Getting ready to take it in and start the process. I've got a pretty good dealer, so we'll see how it goes.

 

[UTDieselRubi]

Yeah the "why" isn't a hill worth dying on for me lol. Regardless, it happens to many jeeps.

If your dealership gives you a hard time about replacing it, fight them. Also, don't let them just replace your one door or tailgate, they should replace everything in one go. Chances are you will develop corrosion everywhere with a hinge. Also, if you can, go to a dealership with their own body shop. Its easier to get it fixed with those ones than with one that has to outsource the bodyshop.

 

[ShadowsPapa]

I've got some on the bottom of my tailgate. Getting ready to take it in and start the process. I've got a pretty good dealer, so we'll see how it goes.

I have seen it in the MIDDLE of the tail gate.
FORD and CHEVY have had problems with it on their hoods for years.
But it's ONLY a Jeep problem - just ask a Jeep person on a forum.

I had some fun (I'll relate this to this thread after a bit) a couple of days ago when I posted the oil geek's video about zinc, wear and friction in a fakebook page. I chose that page because the people there listen to the wrong people and buy oil with high zinc content, and then add MORE and still have problems......... or swear the additive is what they didn't have problems..
I let the flaming go - and sure enough, I lit a hell of a fire. People were in there contradicting the guy, saying he's wrong and their engines must have that high zinc and there's no other reason and nothing else can fix it and so on. It was hilarious. Some of them would have argued with their MIT engineering professors! (all because of what they believed, their opinions based on forum posts, or because of one engine loss)

The relation - it's been my observation that many people come new into a forum and believe that others there are of the same mindset, the same experiences, levels of education and that there are no experts in a forum on anything. There are no professors, chemists, metallurgists, brain surgeons, aerospace engineers, wind tunnel operators, design engineers and so on. Everyone is the same so it's not possible for someone to know more on a subject they are very certain about because of forums posts elsewhere.
This is one example. They swear they know what it is, and it's JEEP and so on. They'd argue with their college chemistry teacher. Heaven forbid someone may know chemistry, metallurgy, plating, solutions, processes and whatnot.

FORD has the issue, GM/Chevy have the issue. They may have resolved by now, but it's not quite as common as some would believe due to the fact that the internet and forums FOCUS such problems into a small space.
If 100 people in a forum have the issue, it's a huge, major issue. Doesn't matter that there are hundreds of thousands of the vehicles out there that do not have the problem. It's focused in a forum so looks a lot worse.

Now - if someone wants to try something, there's an easy way to prevent galvanic reactions real or imagined!
Look at the screws for the hood and door hinges - plastic sleeves preventing the STEEL bolts from direct contact with the NON-steel hinge. Allowing that bolt to contact that hinge, which is likely an aluminum alloy, perhaps a zinc or magnesium alloy, would be a problem.

So try this:

Door closed (to hold everything in place) Shim between the bottom of the door and the door sill or rocker panel if you wish with something padded to further prevent sag of the door while hinges are unbolted.
Remove the bolts holding the lower hinge to the door.
cut a piece of mylar in the shape of the back of the hinge, put holes where the bolts would go through, and put that mylar between the hinge and the door skin.
Also make sure the steel bolts cannot contact the aluminum alloy door skin - they ARE steel.
Do the same for the top hinge once the bottom is done.

Once you prevent electrical contact, it's impossible for any galvanic reaction.
Galvanic reactions also REQUIRE an electrolyte - water, etc. - so if it's dry, there can be no reaction.

The insulator can be extremely thin - it only needs to prevent contact.
Seeing the bolt sleeves should show that Jeep is aware of how metals react with each other. They ain't stupid.

 

[ShadowsPapa]

Chances are you will develop corrosion everywhere with a hinge.

What about the hundreds of thousands who do not?

 

[wranglerrush]

2020 Gladiator, corrosion showed up this spring, so just out of 5 year warranty. Wife’s 2023 wrangler rubicon is beginning to show in two spots on hood near seems where it says rubicon.
Dad has 2021 gladiator that has 3 hinges with bubbling paint.
Friend had 2018 wrangler that all hinges and two doors had bubbling paint. The two doors were pretty severe along bottom 6 inches of door panels. Maybe it’s combo of climate and precipitation, salt usage on road, and location on when it will become noticeable for people. Here in the northeast, I don’t know of anyone without some form of it.

 

[ShadowsPapa]

Dad has 2021 gladiator that has 3 hinges with bubbling paint.

On the hinges, correct? Not on the door skin itself?

Wife’s 2023 wrangler rubicon is beginning to show in two spots on hood near seems where it says rubicon.

What about inside the hood - where the hood framework or skeleton has the aluminum skin crimped around it? I expect it on ALUMINUM where it contacts steel.



Iowa owns stock in every salt mine and calcium chloride manufacturer in the world. It's stacked so high in some places it would fill a typical Iowa barn hay loft to floor, wall to wall. They have special big storage bins for it.

This is all salt - not snow or ice...........

LOL - you can see the salt trail under her Jeep, running to the floor drain!

 

[Wheelin98TJ]

My hood looks terrible. Tailgate has spots too. And of course the hinges. I'll try to post some pics later.

 

[ShadowsPapa]

https://www.mustang6g.com/forums/threads/hood-corrosion-question.193438/

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