什么是共形涂层
共形涂层是在 PCBA 工艺中涂敷在印刷电路板上的一层薄聚合物薄膜，用于保护印刷电路板免受化学损伤和环境因素的影响。这种保护膜与印刷电路板及其元件的轮廓相吻合，是一种不导电的防御性电介质层。使用保形涂料可防止 PCBA 暴露于有可能损害其可靠性的物质或环境条件中。
Conformal coatings can prevent moisture uptake, which can occur when a PCBA is exposed to high humidity levels. Moisture can lead to issues such as corrosion, electrical shorts, and decreased insulation resistance. By applying a conformal coating, the PCBA is shielded from moisture, ensuring its long-term functionality and reliability.
Conformal coatings also act as a barrier, safeguarding the PCBA from exposure to corrosive substances such as chemicals, gases, and other potentially harmful elements. This protective layer prevents direct contact between the PCBA and these corrosive substances, preserving the integrity of the board and its components.
Furthermore, conformal coatings can modify the dielectric strength of the layer surrounding the PCB, providing protection against electrostatic discharge (ESD). ESD is a sudden flow of electricity between two electrically charged objects and can cause malfunctions or permanent damage to electronic components. By acting as an insulating layer, the conformal coating reduces the risk of ESD and enhances the overall reliability of the PCBA.
Originally developed for mission-critical aerospace applications, conformal coatings have become widely used in various industries, including consumer electronics. They are particularly crucial in applications where electronic components are exposed to extreme conditions such as high altitudes, temperature variations, and vibrations. The adoption of conformal coatings in electronic devices aims to protect sensitive components from environmental factors and ensure optimal performance and durability.
常见问题
硅树脂和丙烯酸保形涂料有什么区别
说到保形涂料的类型，丙烯酸涂料和有机硅涂料之间存在一些差异。丙烯酸涂料以其硬度著称，而有机硅涂料则更具柔韧性和更好的抗机械冲击性。此外，有机硅涂料还能承受更恶劣的使用环境，具有更好的憎液性和耐化学性。总之，有机硅涂料质地柔软，但坚韧耐用，是各种应用的最佳选择。
共形涂料中产生气泡的原因
保形涂料中的气泡是由于溶剂或空气夹杂在涂层材料中造成的。这些气泡会导致产品可靠性方面的各种长期问题，如形成导电通路桥、暴露区域腐蚀，以及由于温度波动、冲击或振动导致涂层开裂。
共形涂层是否必要
在印刷电路板上使用保形涂料以保护其免受有害环境和污染物的影响至关重要。湿气会加速分解、降低绝缘电阻并导致导体腐蚀，因此保形涂料是一项重要的保护措施。
什么能溶解保形涂料
在溶解保形涂料时，溶剂的选择至关重要。通常，甲苯和二甲苯等芳香族溶剂是常用的溶剂。不过，根据具体涂层的不同，也可以使用丙酮或己烷等碳氢化合物。
共形涂层印刷电路板有多厚
通常，印刷电路板上的保形涂层厚度为 1 至 5 密耳（25 至 127 微米），在某些情况下甚至可以更薄。如果涂层超过这个范围，则很可能是封装或浇注化合物，它们具有更大的质量和厚度，可增强对电路板的保护。
能否通过共形涂层进行焊接
为了去除保形涂层和聚对二甲苯涂层，可以直接进行焊接。通常情况下，焊接后的表面效果会令人满意。
保形涂料出现橘皮的原因是什么？
保形涂料中的桔皮现象主要出现在溶剂型保形涂料中，如丙烯酸、聚氨酯和合成橡胶。这是由于涂层表面干燥不均匀造成的。
保形涂料和灌封有什么区别
保形涂层一般较薄，从 25 微米到 250 微米不等，因此与 PCB 灌封相比，保形涂层更轻。此外，它占用的空间也更小。保形涂料能有效防止腐蚀和微粒物质等潜在风险。此外，它还具有防水功能，可防止受潮。
共形涂料与非共形涂料的区别是什么？
Conformal coating provides protection to the board while allowing for convenient board repairs. On the other hand, a non-conformal coating, also known as potting or encapsulating, is significantly thicker than a standard conformal coat.
保形涂料是否防水
While conformal coatings can provide a layer of protection against moisture, it is important to note that they are not completely waterproof. Most coatings are semi-permeable, meaning they allow some moisture to pass through. However, conformal coating can effectively prevent current leakage and corrosion caused by ambient moisture.
What if Conformal Coating Is Too Thick
Excessively thick conformal coatings can lead to residual stress, which may result in damage to the electronic device being coated. In such cases, it is necessary to address the issue by either removing and reapplying the coating or grinding it down. The appropriate method to be employed will vary depending on the specific type of coating being used.
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