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Apr 19 – 22, 2022
Vienna, Austria
Europe/Vienna timezone
FR22 starts in Vienna 19 - 22 April 2022 Online Stream: https://event.do/iaea/a/#/events/5048

NON-DESTRUCTIVE METHOD FOR DETERMINING STEEL CORROSION COEFFICIENTS IN LEAD

Apr 20, 2022, 10:40 AM
2h
Vienna, Austria

Vienna, Austria

POSTER Track 4. Fast Reactor Materials (Coolants, Structures) and Components Poster Session

Speaker

Mr Oleg Golosov (Research institute of nuclear materials, (INM JSC))

Description

Three methods are recommended for determining the corrosion coefficients of steels in liquid metal (LM).
The essence of the first method, the so-called metallographic method is to measure the thickness of oxides and study their structure and composition. The main advantage of the method is its relative simplicity, as there is no need to remove any residues of LM or oxides from the specimen, but only preparation of metallographic specimens is required. Shortcomings of the method are its location, the need to know the phase composition and density of oxides for the calculations to determine the corrosion depth in the metal and the inability to determine the removal of corrosion products (СP) of steels in LM. The method is applicable only if there is no shearing of the oxides from the sample or its dissociation during corrosion tests.
The second method, the so-called gravimetric method is based on determining the sample weight loss after corrosion tests. In this case, it is necessary to remove the residues of LM and oxides completely from the specimen. The main advantage of this method is the ability to determine all corrosion coefficients, such as total corrosion losses of metal, depth of corrosion, thickness of the oxides and СP removal to LM. Shortcomings of the method are the need to remove СP completely from the specimen and the need to select chemical pickle solutions that have minimal impact on the metal.
The third method is based on metal thickness measurement of samples before and after corrosion tests as well as the thickness of oxides. The method requires the preparation of metallographic specimens on the samples after testing. This method has the same advantages as the first method. In addition, the third method makes it possible to determine corrosion coefficients and measure the depth of internal oxidation layers and the depth of local types of corrosion.
All these methods are destructible, leading to irreversible destruction of samples under investigation.
This paper analyzes the methodical possibilities of non-destructive method for determining steel corrosion coefficients in Pb, based on the determination of weight and density of samples before and after corrosion tests, and allows the determination of all parameters of steels corrosion. Applicability of the method was tested on Fe12Cr1Si steel samples subjected to corrosion tests in a lead flow at a rate of 0.2–0.3 m/s, containing oxygen within (0.3–1.6)·10-6 weight %, at (490±10) оС during 895 h.

Country/Int. organization Russian Federation
Speaker's title Mr
Speaker's email address golosov_oa@irmatom.ru
Affiliation/Organization Research institute of nuclear materials, (INM JSC)

Primary author

Mr Oleg Golosov (Research institute of nuclear materials, (INM JSC))

Co-authors

Ms Anastasiya Kozlova (Research institute of nuclear materials, (INM JSC)) Ms Natalya Glushkova (Research institute of nuclear materials, (INM JSC)) Ms Tatyana Kuzina (Research institute of nuclear materials, (INM JSC)) Mr Vladimir Tsygvintsev (Research institute of nuclear materials, (INM JSC))

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