# How to Clean Corroded Circuit Board?

_Published: 2025-10-23_

Table of Contents

Toggle

- What Causes Circuit Board Corrode​?
- How to Clean Corroded Circuit Board?
- Best Way to Clean Corroded Circuit Board
- How to Fix Corroded Circuit Board?
- Corroded Circuit Board Repair Precautions
- How to Prevent Corrosion on Circuit Boards?
- Can a Battery Corroded Circuit Board Be Fixed?

How to clean** [corroded circuit board](https://www.bestpcbs.com/blog/2025/10/how-to-clean-corroded-circuit-board/)**? Let’s discover cleaning methods, repair methods and precautions, prevention methods for corroded circuit board.

**Are you troubled with these problems?**

- Why does my circuit board easily corrode in humid environments, leading to frequent failures?
- How can I enhance PCB durability and consistency without increasing costs?
- During design iterations, how can I quickly obtain reliable samples to avoid project delays?

**As a circuit board manufacturer, EBest Circuit (Best Technology) can provide you service and solution:**

- Advanced Anti-Corrosion Coating: We apply eco-friendly protective coatings specifically engineered for high-humidity environments, ensuring long-term circuit board stability and reducing failure risks.
- Flexible Custom Production: Based on your design requirements, we provide rapid prototyping and volume production services, optimizing material selection to achieve high performance within budget constraints.
- Efficient Supply Chain Support: Through streamlined logistics and real-time progress tracking, we guarantee fast response from design to delivery, allowing you to focus on innovation with peace of mind.

**Welcome to contact us if you have any request for circuit board: [sales@bestpcbs.com](mailto:sales@bestpcbs.com).**

## What Causes Circuit Board Corrode​?

**There Are Three Main Reasons for [Circuit Board Corrosion](http://There are three main reasons for circuit board corrosion:):**

**Corrosion Caused by Environmental Factors**

- Moisture and Condensation: Atmospheric moisture condenses on circuit board surfaces, forming electrolyte films that accelerate electrochemical corrosion of metal traces. In high-humidity environments, capillary action in plating gaps and solder joint edges accumulates moisture even without direct submersion, amplifying corrosion risks.
- Salt Spray Environment: Chloride ions in coastal or industrial zones degrade metal passivation layers, triggering pitting and intergranular corrosion. For example, silver plating in sulfide environments generates non-conductive silver sulfide, increasing contact resistance and impairing signal integrity.
- Thermal Cycling Dew Formation: Frequent temperature fluctuations in equipment cause condensation on internal components, particularly pronounced in regions with significant diurnal temperature swings, accelerating corrosion through moisture accumulation.

**Corrosion from Chemical Contamination**

- Flux Residues: Incompletely removed organic acid fluxes decompose into acidic compounds, with residues beneath components progressively corroding copper traces, leading to eventual circuit failure.
- Industrial Gas Erosion: Acidic gases like sulfur dioxide and nitrogen oxides dissolve in water films to form acidic electrolytes, causing green patina (basic copper carbonate) on copper traces and tarnishing solder surfaces, reducing conductivity.
- Biological Degradation: Organic acids from mold metabolism in humid environments erode epoxy substrates, while insect excreta introduce electrolytes that induce localized short circuits and corrosion.

**Material and Process Defects**

- Dissimilar Metal Contact: Direct contact between metals with large electrochemical potential differences (e.g., copper and gold) in the presence of electrolytes forms galvanic cells, preferentially corroding the more active metal and shortening circuit lifespan.
- Protective Coating Failure: Uneven, porous, or insufficiently thick conformal coatings allow corrosive agents to penetrate to metal surfaces, with microcracks exacerbated by vibration environments.
- Electromigration: Prolonged electrical current drives directional movement of metal ions, forming whiskers or voids in conductors, accelerating conductor fracture and compromising circuit reliability.

[https://www.bestpcbs.com/blog/wp-content/uploads/2025/10/Main-27.jpg](https://www.bestpcbs.com/blog/wp-content/uploads/2025/10/Main-27.jpg)

## How to Clean Corroded Circuit Board?

**Below is a guide to how to clean [corroded circuit board](https://www.bestpcbs.com/blog/2025/10/how-to-clean-corroded-circuit-board/):**

**1. Enhanced Safety & Preparation**

- Toolbox Configuration: Equip ESD gloves, safety goggles, and N95 masks. Use an ESD-safe work mat (surface resistance 10?–10? Ω) and a leakage-protected isolation transformer to maintain zero-potential workbench.
- Component Tagging System: Apply a three-color labeling strategy during disassembly—red for high-risk components (e.g., crystals), yellow for components requiring retesting, and green for reusable parts.
- Environmental Control: Maintain 40–60% humidity and use an ionizing blower to neutralize static. For lithium-battery-equipped boards, perform short-circuit tests (e.g., measure battery terminal impedance >1MΩ).

**2. Advanced Mild Corrosion Treatment**

**Cleaning Agent Selection:**

- Alcohol-Based: 99.5% absolute ethanol (conductivity 80% original.

**4. Advanced Deep Corrosion Repair**

- Wire Bonding Protocol: Use 0.3mm silver-plated wire with 280°C hot air gun for conical, smooth solder joints. For high-frequency circuits, adopt coaxial wiring to minimize signal interference.
- Substrate Upgrade Recommendations: In humid environments (RH>60%), use PTFE substrate with ENIG finish (5x corrosion resistance vs. HASL). For RF circuits, Rogers 4350B substrate (ε=3.48) ensures stable dielectric properties.

**5. Systematic Drying & Protection**

- Vacuum Drying Process: Employ molecular sieve vacuum oven at -0.1MPa, 60°C for 4 hours to eliminate internal moisture. For plastic components, cap temperature at 85°C to prevent deformation.
- Conformal Coating Application: Apply acrylic coating (e.g., Humiseal 1A33) at 50–70μm thickness. Use peelable coatings for repairable areas.

**6. Standardized Testing & Maintenance**

- Enhanced Aging Test: Conduct 1000-hour accelerated aging at 85°C/85% RH, monitoring insulation resistance (>100MΩ) and conduction resistance drift (