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Anti-corrosion capability test method of PCB (printed circuit board)

A capability test, PCB board technology, applied in the direction of weather resistance/light resistance/corrosion resistance, measuring devices, instruments, etc., can solve problems that are not involved in corrosion test methods and steps, and have good accuracy and strong pertinence Effect

Inactive Publication Date: 2015-06-10
SHENZHEN ACAD OF METROLOGY & QUALITY INSPECTION
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Technology 5) does not involve how to simulate the corrosive environment of the atmospheric environment, nor does it involve the corrosion test methods and procedures

Method used

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  • Anti-corrosion capability test method of PCB (printed circuit board)
  • Anti-corrosion capability test method of PCB (printed circuit board)
  • Anti-corrosion capability test method of PCB (printed circuit board)

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Experimental program
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Embodiment Construction

[0032] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0033] see figure 1 and figure 2 , the invention provides a method for testing the corrosion resistance of PCB boards, which accelerates the contamination of PCBs in the manner of artificial simulation. Then through performance monitoring and temperature and humidity cycle test, evaluate the pollution and corrosion resistance of PCB single board.

[0034] During the use of PCB boards, when the relative humidity of the air increases, hygroscopic particles such as sulfates and nitrates in the air absorb moisture and deliquescence. Under the action of air flow, particles of salt solutions such as sulfates and nitrates accumulate on the surface of the PCB. These salt solutions are conductive, and as the accumulation increases, the surface insulation resistance of the PCB board decreases, which may reduce the creepage distance and electrical gap...

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Abstract

The invention provides an anti-corrosion capability test method of a PCB (printed circuit board). The anti-corrosion capability test method comprises the following steps of: step A, carrying out preliminary detection on a test sample; step B, spraying a salt solution on a control sample, and detecting the property of the control sample so as to determine a humidity threshold value; step C, spraying a salt solution on the test sample, and carrying out a humidity circulating experiment on the test sample according to the humidity threshold value; and step D, judging whether the test sample subjected to the humidity circulating experiment is qualified. The anti-corrosion capability test method of the PCB provided by the invention has the advantages of being high in pertinence, suitable for evaluating the fouling resistant capacity of the single PCB, and being high in imitating pertinence and veracity.

Description

technical field [0001] The invention relates to a method for testing the corrosion resistance of a PCB board. Background technique [0002] In the process of industrial production and transportation, due to the combustion of gasoline or other chemical raw materials, a large number of particles such as sulfate and nitrate are produced, which are discharged into the atmosphere and cause serious pollution. The diameter of these particles is about 0.5 μm to 1 μm. After absorbing water, they form a salt solution and accumulate on the surface of the printed circuit board (PCB, Printed circuit board) assembled by communication equipment, forming conductive pollutants. After accumulating and reaching a certain amount, such particles will form a conductive path on the surface of the PCB, which will cause leakage current or voltage breakdown, making the PCB single board and even the system function invalid, and even electrical safety hazards. The existing experimental methods for eva...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N17/00
Inventor 朱建华李岩钟浩陈显顾舒望李西
Owner SHENZHEN ACAD OF METROLOGY & QUALITY INSPECTION