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Test method used for corrosive wear

A test method, corrosion and wear technology, applied in the field of mobile communications, can solve problems such as low signal-to-noise ratio, difficult steady state of corrosive media, difficult to achieve steady state, etc., and achieve reliable measurement results

Inactive Publication Date: 2017-12-15
JINAN UNIVERSITY
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  • Abstract
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  • Application Information

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Problems solved by technology

There are two main reasons: 1. The polarization current near the self-corrosion potential is very small, generally less than 0.01mA, the measurement of the tiny polarization current value, the test system with low signal-to-noise ratio, and poor anti-interference performance
2. It is difficult to achieve a steady state under impact corrosion wear conditions. On the one hand, the electrode surface is subjected to the impact of the upper sample and the abrasion of the slurry, and its electrochemical state has been changing; on the other hand, the stirring of the rotating electrode and the slurry Make it difficult for the corrosive medium to reach a steady state; small changes in the electrochemical state of the electrode surface and the state of the corrosive medium will cause large fluctuations in the measured polarization current value

Method used

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Embodiment 1

[0023] Because the process of measuring the local anodic reaction polarization curve of a corrosion electrode in an oxygen-removing medium is relatively complicated, the process of measuring the local cathodic reaction polarization curve of an inert electrode is relatively simple. Therefore, this embodiment adopts the method of combining the local cathodic reaction polarization curve of the inert electrode and the self-corrosion potential Ecorr of the corroded electrode to obtain the corrosion current density ik, which solves the problem that the corrosion test method requires high precision of the machine and can only be static The state of the measurement.

[0024] There are three traditional techniques for measuring corrosion rate electrochemically: linear polarization method, Tafal linear extrapolation method or weak polarization region fitting method, which are obtained by measuring the polarization curve and analyzing the values ​​near the self-corrosion potential in the ...

Embodiment 2

[0039] Table 1 shows the weight loss of medium chromium steel under static immersion corrosion in 1molHCl / L aqueous solution at room temperature. Soak corrosion for 24 hours.

[0040] Table 1. Corrosion weight loss of medium chromium steel in static immersion in 1molHCl / L aqueous solution at room temperature

[0041]

[0042] The weight loss rate of pure impact wear is calculated by formula (1).

[0043]

[0044] Where: ΔE is the pure impact wear loss of the material (unit: g),

[0045] m is the outer cylindrical surface area of ​​the sample (unit: m 2 ),

[0046] t is the test time h (hours).

[0047] If the metal corrosion current i is obtained k (unit: μA), the corrosion weight loss rate W can be converted according to Faraday's law corr (unit: g / m 2 h), the formula is as follows:

[0048]

[0049] i corr = i k / s (3)

[0050] Among them: i corr is the metal corrosion current density (unit: μA / cm 2 ),

[0051] M is the gram atomic weight of the metal (u...

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Abstract

The invention discloses a test method used for corrosive wear. The method comprises the following steps: calculating the metal corrosion current ik through combining the local cathodic reaction polarization curve of an inert electrode with the self-corrosion potential Ecorr of a corrosion electrode; calculating the metal corrosion current density icorr; and converting the corrosion weight loss rate Wcorr according to the Faraday's law. The test method for simulating the corrosive wear service condition is provided against the dynamic corrosion and wear service test under wear and corrosion conditions when the surface brittle delamination caused by a cutting furrow and impact corrosion wear environment is the main cause for the failure of an anti-wear part containing a corrosion medium. The method solves and determines the measurement of the total corrosive wear weight loss of a metal material in the corrosion medium, can be used for measuring the electrochemical corrosive wear in dynamic corrosive war, and effectively instructs the quantitative researches of the corrosion in the wearing process.

Description

technical field [0001] The invention relates to the technical field of mobile communication, in particular to the corrosion amount test of dynamic wear in a corrosive medium, in particular to a test method applicable to corrosion wear. Background technique [0002] At present, there are three commonly used electrochemical techniques for measuring corrosion rate: linear polarization method, Tafal linear extrapolation method and weak polarization region fitting method. These techniques are obtained by measuring the polarization curve and analyzing the curve. The determination of the polarization curve requires harsh test conditions and high requirements for the sensitivity and stability of the test instrument. [0003] The measurement of the polarization curve under static conditions is more convenient and easy to achieve steady state conditions. Under dynamic conditions, especially when the electrode is subjected to wear and impact loads, it is difficult to accurately measur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/56G01N17/02G01N17/00
CPCG01N3/567G01N17/006G01N17/02
Inventor 涂小慧张鹏邓淑玲林志丹李卫
Owner JINAN UNIVERSITY
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