Definition: Corrosion is the chemical degradation of metal components on a phone’s logic board caused by water damage. Minerals and ions in water react with exposed copper traces, solder joints, and component pads — forming non-conductive oxides that disrupt electrical signals and physically destroy the board over time. Visible as green or white deposits.
Why it matters for phone repair
Corrosion is the reason water damage becomes significantly harder to repair the longer it’s left untreated. A phone that gets wet and is immediately powered off and cleaned has a high survival rate. The same phone left for a week before being brought in may have corrosion that has eaten through critical board traces — turning a straightforward repair into a complex microsoldering job or, in severe cases, an unrecoverable board.
Singapore’s tropical humidity means corrosion is a year-round problem — even phones that were never submerged can develop internal corrosion from persistent humidity exposure over months and years.
How corrosion works
When water contacts a phone board, dissolved minerals and ions in the water act as an electrolyte — enabling electrochemical reactions between the board’s copper traces, solder joints, and the electrical current present in a powered device. This accelerates oxidation: copper reacts to form copper oxide (green) and copper hydroxide (blue-green). Solder joints develop tin whiskers and crack. Aluminium shielding cans corrode white.
Shareable fact: Salt water and chlorinated water corrode phone boards up to 10x faster than fresh water because they contain far more ions to drive electrochemical reactions. A phone dropped in the sea for 10 seconds can be harder to save than one submerged in fresh water for a minute.
Real example
A customer drops a Samsung Galaxy S22 into a condo pool. It appears to work initially. Three days later it stops charging. When opened, the board shows heavy green corrosion across the charging circuit area — the charging port pads are nearly destroyed. Ultrasonic cleaning removes the corrosion, microsoldering bridges two destroyed trace sections, and a new charging port restores full function. If left another week, the corrosion would have spread to the Power IC — making the repair far more complex.
Common mistakes
- Waiting days after water damage before seeking repair. Every 24 hours of delay exponentially increases the spread of corrosion. Same-day treatment dramatically improves repair success rate.
- Using a phone that got wet without cleaning it first. Powering a corroding board accelerates electrochemical reactions. Even if the phone appears to work, internal corrosion is spreading.
- Assuming corrosion is only visible in severe cases. Mild corrosion often isn’t visible to the naked eye — it’s only detectable under a microscope. The phone may appear clean internally but fail months later when corrosion reaches a critical component.
Related terms
- Water Damage — the cause of corrosion
- Ultrasonic Cleaner — the primary treatment for removing corrosion from phone boards
- LDI — the indicator that confirms water ingress before corrosion is visible
- Microsoldering — used to repair traces and pads destroyed by severe corrosion
Further reading
- Water Damaged Phone? 8 Steps to Save Your Device — stopping corrosion before it starts
- Is Your Phone Actually Waterproof? — why IP-rated phones still corrode
Green deposits or corrosion visible on your board? BreakFixNow cleans and repairs corroded boards. The sooner you bring it in, the better the outcome.
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