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Failure behaviors and mechanisms of high-ohmic resistors protected by PF/EP paint in heat and humid environment

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Abstract

Phenolic formaldehyde(PF)and epoxy(EP)resins are commonly used in electronic packaging. In this paper, high-ohmic resistors(2.2 MΩ, ±0.5%,)with Cr-Si film were coated by PF/EP paint, and the resulting coated resistors were used for heat and humid(HH)experiments. The experimental results show that the corrosion of band-like resistive films is selective and isotropic, and that the corrosion spots in resistive films all form along grooves and extend in the same direction. It is revealed that OH- ions are generated due to the electrochemical reactions of resistive film in HH experiments, so a NaOH aqueous solution with pH about 10 was used to study the effects of absorbed water and OH- ions on PF/EP polymer film. The results indicates that the color of some part on PF/EP polymer film changes due to corrosion, and that the corrosion part of the polymer film is easy to be peeled off. It can be inferred that OH- ions generated in HH experiments may play a catalytic role in the chemical reactions between polymer film and the absorbed water, which accelerates the degradation of PF/EP protection film for a resistor.

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Authors and Affiliations

  1. School of Electronic Information Engineering, Tianjin University, Tianjin, 300072, China

    Xiuyu Wang  (王秀宇), Qiang Cheng  (程 强), Xiaopin Ma  (马小品), Hao Zhang  (张 浩), Mingxiu Li  (李明秀), Tongning Chen  (陈同宁) & Ping Zhang  (张 平)

  2. Tianjin Tricyclic Resistor Co., Ltd, Tianjin, 300350, China

    Zhixun Li  (李志珣)

Authors
  1. Xiuyu Wang  (王秀宇)
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  2. Qiang Cheng  (程 强)
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  3. Xiaopin Ma  (马小品)
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  4. Hao Zhang  (张 浩)
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  5. Mingxiu Li  (李明秀)
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  6. Tongning Chen  (陈同宁)
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  7. Ping Zhang  (张 平)
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  8. Zhixun Li  (李志珣)
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Correspondence to Xiuyu Wang  (王秀宇).

Additional information

Supported by the National Natural Science Foundation of China(No. 61201038).

Wang Xiuyu, born in 1978, male, Dr, associate Prof.

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Wang, X., Cheng, Q., Ma, X. et al. Failure behaviors and mechanisms of high-ohmic resistors protected by PF/EP paint in heat and humid environment. Trans. Tianjin Univ. 22, 388–395 (2016). https://doi.org/10.1007/s12209-016-2762-3

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  • DOI: https://doi.org/10.1007/s12209-016-2762-3

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