Printed circuit board service life assessment method based on salt-spray environment test

Abstract

The invention discloses a printed circuit board service life assessment method based on a salt-spray environment test. The method comprises the following steps of associating the failure mode of the printed circuit board with a working condition, forming an accelerated life predication model based on the salt-spray test, drawing a changing curve between three environment factors of temperature, salt solution concentration and salt spray settling volume and test sample corrosion area by the method of combination of test data and Arrhenius accelerated life predication model, so as to predicate the service life of the printed circuit board under the salt-spray working condition. By utilizing the method, the problem that the accurate modeling is impossible in system with complex failure mechanism when analyzing small sample by traditional reliability analytical method is solved; secondly, during the researching stage of a device, through developing the accelerated life test, the test time is shortened, the service life assessment level of marine equipment is improved, the possible problems are exposed and solved completely before service, so as to formulate scientific and reasonable maintenance decision to save maintaining cost and guarantee complete war preparedness and successful task.

Description

technical field [0001] The invention belongs to the technical field of reliability analysis and life evaluation of electronic products, and in particular relates to a method for evaluating the life of a printed circuit board used in a salt spray environment. Background technique [0002] The electronic control module of maritime weapons and equipment is the control system of maritime weapons and equipment, which controls the entire launching process of weapons and coordinates the execution sequence of various mechanical devices during the launching process. It is the "brain" of maritime weapons and equipment. A highly reliable electronic control module is an important guarantee for the safety of maritime weaponry systems. Once the electronic control module fails during the service of the equipment, the subsystems of the entire equipment system will lose their correlation, affect the normal operation of the service process, and even pose a serious threat to the safety of weap...

AI Technical Summary

Problems solved by technology

Printed circuit boards are susceptible to corrosion due to working in marine environments, and salt deposits will also affect the electrical performance of printed circuit boards, and these damages often affect their environmental adaptability, reliability and service life

[0004] The printed circuit board is used very infrequently during actual service, and each time it is used for only a few minutes

At the same time, due to the special working environment, it is difficult for the existing life reliability analysis method to express the specific failure mode of the printed circuit board and evaluate its service life

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