Electrolytic capacitor leak in storage?

[cloudff7]

there a risk of this aluminum electrolytic capacitor of electronic device long term storage opening and leaking acid and corroding the PCB board?

[stj]

with cheap rubish caps - yes.
but it takes years

[cloudff7]

with cheap rubish caps - yes.
but it takes years

In the long-term storage of electronic devices, does the leakage of acid from the aluminum electrolytic capacitor that corrodes the PCB occur because the protective layers have been slowly corroded over the years and opened to release the acid in board?

[redwire]

No. "protective layers" corroded? Work on your English. It's the rubber bung shrinking, drying out that allows the electrolyte to leak out in storage. It's uncommon unless they are cheap chinese capacitors that use recycled car tire rubber lol, or the reflow was too hot.

[cloudff7]

No. "protective layers" corroded? Work on your English. It's the rubber bung shrinking, drying out that allows the electrolyte to leak out in storage. It's uncommon unless they are cheap chinese capacitors that use recycled car tire rubber lol, or the reflow was too hot.

Rubber is too brittle to hold corrosive liquid but do they use it? I don't know the manufacturers of the electrolytic capacitors in my devices, I have cartridge consoles from the early 90s, Philco and Toshiba CRT TVs from the early 2000s, PS2 slim 90000, and the most recent ones are TVBOX T95 Max Plus, power supply Chinese 5 and 12v, asus sata dvd drives all these devices use electrolytic capacitors and are stored

[SMDFlea]

Rubber is too brittle to hold corrosive liquid but do they use it? I don't know the manufacturers of the electrolytic capacitors in my devices, I have cartridge consoles from the early 90s, Philco and Toshiba CRT TVs from the early 2000s, PS2 slim 90000, and the most recent ones are TVBOX T95 Max Plus, power supply Chinese 5 and 12v, asus sata dvd drives all these devices use electrolytic capacitors and are stored

TROLL

https://www.badcaps.net/forum/general-topics/general-capacitor-questions-issues/88113-question-electrolytic-capacitor-from-1990`s?p=1710916#post1710916

https://forum.digikey.com/t/shelf-li...apacitors/7946
https://maker.pro/forums/threads/que...acitor.296053/
https://maker.pro/forums/members/ele...recent-content
https://maker.pro/forums/threads/que.../#post-1819948
https://forums.tomshardware.com/thre...#post-22827718
https://eepower.com/forums/members/c...recent-content
https://forum.zwame.pt/threads/duvid...itico.1068226/

https://www.electronica-pt.com/forum...-ja-respondido

Post #4 Quote:

User names:
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From Brazil, but claiming UK on two forums

Obsessions:
Storing things in ridiculous ways, flooding multiple forums, opening multiple accounts, asking the same question over and over

Parece que não somos apenas nós por aqui....

[redwire]

Just confirming - do caps bulge and then leak although in storage?

Aliexpress (Xnbada store) power supply, JCPOWER JC-10-5, 5V 2A. Unused although I remember doing a brief load test on it.
Sits on my shelf for over 2 years and today I see this bulging cap 1,000uF 16V yung Li garbage brand. It's about 145uF and ESR 1.3Ω. IC is ME8115F.

I'm assuming it made it's own gas, sitting there corroding inside- and then broke the vent.

[petehall347]

i have seen lots going bad by not being used . maybe they had started going bad already though as they are on scrap boards .

[redwire]

The stronger the electrolyte (acid H₂SO₄) concentration, the more capacitance you get. The corrosion-inhibitors, the missing secret sauce behind the "capacitor plague" I don't think are the problem here.
It's just china being cheap. But I didn't expect hydrogen bubbling while no voltage was applied.

[stj]

panasonic FC arent chinese or cheap, but i'v seen sozens of old ones leaking from the bung.

[redwire]

I think that's a manufacturing defect with the Panasonic FC and it's not enough to make the cap fail or wreck a PCB. Just a little green crud on the leads. Could be the wash, excess electrolyte during assembly on the leads.
It's not making enough hydrogen gas to bubble the top and vent and die lol.

[stj]

no, crust or puddles under them.
worst are sony psu's in SGI computers, and european/220v dreamcast psu's