A method for comparing the protective effects of different oxide films on metal substrates and its application
A protective effect, metal matrix technology, applied in the direction of material analysis, instruments, measuring devices, etc. using wave/particle radiation, which can solve problems such as misleading information
Active Publication Date: 2022-05-13
TIANJIN UNIV
View PDF3 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
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.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a method for comparing the protective effects of different oxide films on metal substrates and its application. The comparison method includes the following steps: step 1, performing XPS depth analysis on the oxide film on the surface of the sample, and selecting the metal substrate that has the most important effect on corrosion resistance. The decisive element is used as the reference element; step 2, find the position where the reference element just appears in the metal state during the depth analysis, and then compare the content of Fe elements with different valences here. The more Fe elements with low valence state, the more the oxide film The better the protection ability. The invention can accurately compare the protective effects of different oxide films on the metal substrate.
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
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