Papers by Keyword: Corrosion Model

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Authors: Liu Jie Xu, Bao Yuan Li, An Heng Si, Shi Zhong Wei
Abstract: The corrosion property of high chromium cast iron was test under different phosphoric acid medium concentration. On the base of experimental data, the binary equation model of corrosion weight loss (W) versus phosphoric acid concentration and corrosion time (c, t) was built using multiple regression analysis, which can predict corrosion property of high chromium cast iron effectively. The prediction results show that the corrosion weight loss rises lineally with increasing corrosion time, and the corrosion rate rises quadratically with increasing phosphoric acid concentration. The corrosion failure mechanism is that chromium composite carbides (M7C3) stand out of matrixes surface after the matrixes composed of martensite and austenite are corroded firstly, then the M7C3 carbides drop out of matrixes when the matrixes can not wrap M7C3 carbides, resulting gradual corrosion of high chromium cast iron. The prediction values have sufficiently mined the basic domain knowledge of corrosion process of high chromium cast iron under phosphoric acid medium. Therefore, a new way of predicting corrosion property according to corrosion conditions was provided by the authors.
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Authors: Ouk Sub Lee, Dong Hyeok Kim
Abstract: In this paper, the failure probability is estimated by using the FORM (first order reliability method), the SORM (second order reliability method) and the Monte Carlo simulation to evaluate the reliability of the corroded pipeline. It is found that the FORM technique is more effective in estimating the failure probability than the SORM technique for B31G and MB31G models with three different corrosion models. Furthermore, it is noted that the difference between the results of the FORM, the SORM and the Monte Carlo simulation decreases with the increase of the exposure time.
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Authors: Tony Trueman, Peter Trathen, Kayne Begbie, Len Davidson, Bruce Hinton
Abstract: DSTO has been working for more than a decade on the development of tools to monitor the atmospheric corrosion of military aircraft. Initially, this work involved the development and use of sensors, both corrosion and environmental. The work has evolved to include corrosion models and prognostic capabilities to give a more complete corrosion prognostic health management (CPHM) system. This paper will give a historical perspective of the development of these tools at DSTO and elsewhere along with their uses and shortcomings. It will also explain how increases in the understanding of both atmospheric and aircraft corrosion have fed into the development of a more complete CPHM system. The current system is being developed by DSTO for the Australian Defence Force (ADF) with a view to facilitating condition-based maintenance for corrosion prevention that will replace maintenance dictated by either flying hours or service duration. The system functions by using sensors to measure the environmental exposure of the aircraft and models to determine the extent of corrosion expected from this exposure. The CPHM system will give the maintenance engineer a tool that will enable condition-based maintenance to be achieved and remove the requirement for costly inspection procedures, especially of hard to access areas. Finally, the work being undertaken to extend the CPHM system will be discussed.
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