Maybe it’s galvanic corrosion between the stainless screws and the aluminum? Antisieze is a good idea. Will try loosening the screws on mine later to apply some.
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- Thread starter larsottar
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Yep, aluminum and stainless steel together are a bi-metallic corrosion risk or galvanic corrosion. They have to careful with these small trailers comprising of a steel chassis with aluminum deck and side extrusions, makers may use plastic washers or similar where contact is made between the two materials. If both are dry no problem, moisture and it all starts.
When theTsdz2 was new 7 years ago, I didn't realize galvanic corrosion will be a problem, so have mounted the case without any grease or plastic washers. Just because it was very easy to release these screws then. After a while I saw posts mentioning this problem, I bought anti seize, but then it was already too late. Because my Tsdz2 was running fine I let it.
Out of curiousity.... You advice to add plastic washers too for better prevention?
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Took the 3 hex screws off (the ones that need 2.5 mm hex bit) w/o problems. No corrosion at all anywhere. Screws are non magnetic so stainless. Put anti seize on and put them back.
How do plastic washers prevent corrosion between the threads.
I can only go on what I have seen with these small trailers, I would try anything for a few pence if it stopped the corrosion, perhaps waterproof grease or something on the threads as I am more a dry weather rider and do not jet wash the bike down I have had no problems with galvanic corrosion. I only seem to get a bit of surface corrosion on the die cast casings due to the paint being knocked off on the underside, so just clear the area with fine wet and dry, paint it and then cover with gaffer tape. then fit a "sump" guard I 3D printed. But they do have a better version on Aliexpress. https://www.aliexpress.com/item/1005010425222638.html Do have a couple but not fitted as of yet. They stop the crap only, might try one on the hard tail I am putting together, but that may still change to use a 26" Specialized Epic Comp Frame I have, have to check if the battery will fit in the triangle of the Epic though.
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In those 7 years, did you ride in high moisture or salty environement? I never ride in the rain. I also keep the bike indoors @ room temp. That may explain why I do not have galvanic corrosion, yet.
Never. I don't like recreational biking with rain. So I use my ordinary bike for all weather conditions and shopping , but my ebike only with dry weather, from spring to autumn for some longer distances and holidays. Also all my bikes are stored indoors.
But if the black paint is damaged under the screwheads, it could be that that corrosion isn't on the threads, but between screw head and case. The screw heads are relatively large for the size of the allen key.
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Won’t know if galvanic corrosion is the reason till you remove the screws to inspect.
That is correct, but preferably without damage.
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