{"id":5531,"date":"2023-07-04T19:01:52","date_gmt":"2023-07-04T11:01:52","guid":{"rendered":"https:\/\/www.dcl-controls.com\/?p=5531"},"modified":"2025-03-31T08:59:59","modified_gmt":"2025-03-31T08:59:59","slug":"humidity-reduce-usage-life","status":"publish","type":"post","link":"https:\/\/dclcontrols.com\/ja_jp\/%e3%82%b5%e3%83%9d%e3%83%bc%e3%83%88\/%e3%82%bf%e3%83%bb%e3%82%a2%e3%82%ad%e3%83%a5%e3%83%86%e3%83%bc%e3%82%bf%e3%83%bc\/humidity-reduce-usage-life","title":{"rendered":"\u6e7f\u5ea6\u304c\u30a2\u30af\u30c1\u30e5\u30a8\u30fc\u30bf\uff08\u96fb\u52d5\u30d0\u30eb\u30d6\uff09\u306e\u5bff\u547d\u3092\u7e2e\u3081\u308b\uff1f"},"content":{"rendered":"
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Humidity is well known to cause damage to electronic components. One of the primary ways humidity reduces the lifespan of electric actuators is through ionic migration short circuits<\/strong>.<\/p>

1. What is Ionic Migration Short Circuit?<\/strong><\/h2>

<\/p>

Ionic migration occurs when moisture and contaminants<\/strong> on a circuit board facilitate the movement of ions between conductors, leading to short circuits. The process follows these steps:<\/p>

1\ufe0f\u20e3 Presence of an electric field<\/strong> between two conductors on an insulator.
2\ufe0f\u20e3 Electrolytic reaction<\/strong> occurs at the anode, releasing metal ions.
3\ufe0f\u20e3 Ions migrate<\/strong> under the influence of the electric field toward the cathode.
4\ufe0f\u20e3 Once enough ions accumulate at the cathode, a conductive bridge forms<\/strong>, causing a short circuit.<\/p>

This leads to the failure of the actuator’s PCBA (Printed Circuit Board Assembly)<\/strong>.<\/p>

2. Common Causes of Ionic Migration on PCBA<\/strong><\/h2>

Ionic migration short circuits typically occur in the following conditions:<\/p>

\u2714 Impurities and moisture on PCB substrate<\/strong>
\u2714 Residual electrolytes<\/strong> from plating processes left in PCB holes
\u2714 Flux, adhesives, or other electrolytic materials<\/strong> used during PCBA manufacturing
\u2714 Dust, ionic contamination, and condensation<\/strong> accumulated on the PCBA over time<\/p>

3. Preventive Measures Against Ionic Migration<\/strong><\/h2>

To extend the lifespan of electric actuators and prevent failures due to humidity<\/strong>, the following measures are recommended:<\/p>

\u2705 Apply Conformal Coating (Three-Proofing Paint)<\/strong><\/h3>

<\/p>

  • Coating the PCBA with a conformal coating protects it from dust, moisture, and contaminants<\/strong>.<\/p><\/li>

  • This is one of the most effective<\/strong> measures to prevent ionic migration.<\/p><\/li><\/ul>

    \u2705 Fully Encapsulate the PCBA<\/strong><\/h3>

    <\/p>

    • In high-humidity or applications with large temperature fluctuations<\/strong>, fully encapsulating<\/strong> the circuit board provides the highest level of protection.<\/p><\/li><\/ul>

      \u2705 Use a Dehumidifying Heater (PTC Heater)<\/strong><\/h3>

      <\/p>

      • Installing a PTC dehumidifying heater<\/strong> helps reduce humidity inside the sealed enclosure.<\/p><\/li>

      • However, in IP67+ fully sealed enclosures<\/strong>, dehumidifying heaters may not immediately reduce air humidity<\/strong> at the initial heating stage.<\/p><\/li>

      • Therefore, in certain situations, it may not completely prevent ionic migration short circuits<\/strong>.<\/p><\/li><\/ul>

        By implementing these protective measures<\/strong>, the reliability and lifespan of electric actuators can be greatly improved<\/strong>, ensuring stable performance in humid environments<\/strong>.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"

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