Method for comparing protection effects of different oxidation films on metal matrix and application thereof
A metal substrate and protection effect technology, which is applied in the field of comparing the protective effects of different oxide films on metal substrates, and can solve problems such as information misleading
Active Publication Date: 2020-03-31
TIANJIN UNIV
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- Description
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Problems solved by technology
TEM can only observe the local characteristics of the sample in the nanometer range. However, for the stainless steel oxide film with a thickness of hundreds of nanometers, TEM observation may be misled by local information.
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0021] When the parameters of the simulated PWR environment are stable, a test is made to keep the sample under constant load in the PWR environment. Specifically, the sample is placed at 1×10 -4 the s -1 The strain rate was loaded to 150MPa (90% of the yield strength of CF8A SS at 300°C), and then kept under constant load for 240 hours to obtain a constant load sample.
Embodiment 2
[0023] When the simulated PWR environment parameters are stable, the sample is at 1×10 -4 the s -1 The strain rate was loaded to 150MPa (90% of the yield strength of CF8ASS at 300°C), and then kept at a constant load for 120 hours. After that, the sample was tested at 1×10 -3 the s -1 Overload occurs at a strain rate of 1.6, and then the load drops to 150MPa, and continues to be corroded in the PWR environment for 120 hours to obtain an overloaded sample.
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The invention discloses a method for comparing protection effects of different oxidation films on a metal matrix and application thereof, and the comparison method comprises the following steps: step1, performing XPS deep analysis on the oxidation film on the surface of a sample, and selecting an element having a decisive effect on metal corrosion resistance as a reference element; and step 2, finding the position where the reference element just has the metallic state in the deep analysis process, then comparing the contents of Fe elements with different valences at the position, and the higher the content of the Fe element with the low valence state being, the better the protection capacity of the oxidation film being. According to the method, the protection effects of different oxidation films on the metal matrix can be accurately compared.
Description
technical field [0001] The invention relates to the technical field of stress corrosion, in particular to a method for comparing the protective effects of different oxide films on metal substrates and its application. Background technique [0002] The metal will form an oxide film during the oxidation process. When the oxide film reaches a certain level, it has certain protection for the metal substrate and the oxidation is blocked. The composition and structure of the oxide film are different, and the protective effect on the metal substrate is also different. For example, CF8A austenitic stainless steel under different external loads will form double-layer oxide films with different structures in a high-temperature water environment of 300 °C. When the applied load is less than the yield strength, the inner oxide film is dense and continuous Cr 2 o 3 Oxide; when the applied load is greater than the yield strength, the inner oxide film is (Ni x Fe 1-x )(Cr y Fe 1-y )...
Claims
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IPC IPC(8): G01N23/2273
CPCG01N23/2273
Inventor 徐连勇许有伟荆洪阳韩永典赵雷
Owner TIANJIN UNIV