Dual-ring electrochemical dynamic potential reactivating evaluating method for diphase stainless steel intercrystalline corrosion sensitivity

A duplex stainless steel and intergranular corrosion technology, which is applied in weather resistance/light resistance/corrosion resistance, scientific instruments, measuring devices, etc., to achieve good stability, high sensitivity, and accurate judgment

Inactive Publication Date: 2010-06-30
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At this stage, there is no detection method for duplex stainless steel

Method used

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  • Dual-ring electrochemical dynamic potential reactivating evaluating method for diphase stainless steel intercrystalline corrosion sensitivity
  • Dual-ring electrochemical dynamic potential reactivating evaluating method for diphase stainless steel intercrystalline corrosion sensitivity
  • Dual-ring electrochemical dynamic potential reactivating evaluating method for diphase stainless steel intercrystalline corrosion sensitivity

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preparation example Construction

[0026] 2) Preparation of electrochemical evaluation solution: prepare a mixed solution of sulfuric acid and hydrochloric acid at room temperature, the concentration of sulfuric acid solution in the mixed solution is 1~3mol / L, the concentration of hydrochloric acid solution is 0.1~2mol / L, and the concentration of sulfuric acid solution is preferably 2mol / L, the concentration of hydrochloric acid solution is 1mol / L;

[0027] 3) The establishment of the electrochemical evaluation system: in the evaluation solution prepared in step 2), a standard three-electrode system consisting of an auxiliary electrode, a reference electrode and a working electrode is established, wherein the auxiliary electrode is a platinum sheet, and the reference electrode is a saturated glycerin Mercury electrode, the working electrode is the sample, and the temperature of the evaluation solution is 20-40°C, preferably 30°C;

[0028] 4) DL-EPR test: use the electrochemical workstation to control the potent...

Embodiment 1

[0057] The intergranular corrosion susceptibility evaluation of the sensitized 2205 duplex stainless steel is carried out by using the dual-loop electrochemical dynamic potential reactivation evaluation method for intergranular corrosion sensitivity of duplex stainless steel, including the following steps:

[0058] 1) Sample pretreatment: the duplex stainless steel sample to be tested is firstly sanded to 180# step by step with sandpaper, and then mechanically polished to 1.5 μm and degreased;

[0059] 2) Preparation of electrochemical evaluation solution: prepare sulfuric acid solution and hydrochloric acid solution at room temperature, the concentration of the sulfuric acid solution is 1mol / L, and the concentration of the hydrochloric acid solution is 0.1mol / L;

[0060] 3) The establishment of the electrochemical evaluation system: in the evaluation solution prepared in step 2), a standard three-electrode system consisting of an auxiliary electrode, a reference electrode and ...

Embodiment 2

[0064] The intergranular corrosion susceptibility evaluation of the sensitized 2205 duplex stainless steel is carried out by using the dual-loop electrochemical dynamic potential reactivation evaluation method for intergranular corrosion sensitivity of duplex stainless steel, including the following steps:

[0065] 1) Sample pretreatment: the duplex stainless steel sample to be tested is firstly sanded to 1500# step by step with sandpaper, and then mechanically polished to 3 μm and degreased;

[0066] 2) Preparation of electrochemical evaluation solution: prepare sulfuric acid solution and hydrochloric acid solution at room temperature, the concentration of the sulfuric acid solution is 3mol / L, and the concentration of the hydrochloric acid solution is 2mol / L;

[0067] 3) The establishment of the electrochemical evaluation system: in the evaluation solution prepared in step 2), a standard three-electrode system consisting of an auxiliary electrode, a reference electrode and a w...

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Abstract

The invention discloses a dual-ring electrochemical dynamic potential reactivating evaluating method for diphase stainless steel intercrystalline corrosion sensitivity, which comprises the following steps: first, pre-treating specimen; second, preparing electrochemical evaluating solution;third, establishing electrochemical evaluating system; fourth, DL-EPR testing; fifth, judging intercrystalline corrosion sensitivity. The invention adopts mixture-solution of sulphuric and hydrochloric acids as the evaluating solution, can solve the technical problems of passive potential and corrosion potential, separate the passive potential and corrosion potential according to the concrete specimen of a diphase stainless steel, thereby realizing effective and accurate judgment about the diphase stainless steel intercrystalline corrosion sensitivity, establishing the dual-ring electrochemical dynamic potential reactivating evaluating method for diphase stainless steel intercrystalline corrosion sensitivity according to the diphase stainless steel features, and further obtaining judging criterion for diphase stainless steel intercrystalline corrosion sensitivity. The method has simple process, high sensitivity, good stability, high operability, economic property and environmental-protection.

Description

technical field [0001] The invention belongs to the technical field of intergranular corrosion sensitivity evaluation of duplex stainless steel, and in particular relates to a double-loop electrochemical dynamic potential reactivation evaluation method for intergranular corrosion sensitivity of duplex stainless steel. Background technique [0002] Duplex stainless steel (Duplex Stainless Steel, abbreviated as DSS) has the advantages of both austenitic and ferritic stainless steel, and has good corrosion resistance and mechanical properties. It is widely used in sexual industrial production [S.Bernhardsson, in: Proceedings of the Conference Duplex Stainless steel's91, Beaune, Les editions dephysique, 1991, pp.185.]. However, improper heat treatment and welding process will cause a large amount of secondary phases such as σ phase, nitride, and carbide to precipitate in duplex stainless steel, and the appearance of these secondary phases will have a great impact on its intergra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/02
Inventor 周明杰孙道明许勇
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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