Cathode protection test probe, cathode protection test device and method for evaluating cathode protection effect of metal in seawater

A cathodic protection and testing device technology, applied in the field of devices and evaluation of cathodic protection effect of metals in seawater, cathodic protection test probes, can solve the problem that cracks are easily formed on the sealing edge of insulating coatings, crevice corrosion cannot be evaluated at the same time, and insulating coatings are easy to remove There are problems such as residues, so as to achieve the effects of low manufacturing cost, strong practicability, and improved stability and reliability

Inactive Publication Date: 2018-03-09
SINOPEC ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has the following disadvantages: it cannot simulate the flowing seawater environment; the production of the sample requires welding wires and coating, which is troublesome and time-consuming; the edge of the insulating coating is easy to form crevices, causing crevice corrosion; the insulating coating is removed after the test. Easy to have residue, resulting in unreliable weight loss data
However, this method is aimed at general corrosion, and cannot evaluate crevice corrosion under cathodic protection at the same time, and cannot conduct multiple sets of tests in the same device at the same time, and the test period is long and the efficiency is low

Method used

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  • Cathode protection test probe, cathode protection test device and method for evaluating cathode protection effect of metal in seawater
  • Cathode protection test probe, cathode protection test device and method for evaluating cathode protection effect of metal in seawater
  • Cathode protection test probe, cathode protection test device and method for evaluating cathode protection effect of metal in seawater

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Embodiment 1

[0096] like figure 1 - Figure 5As shown, the present embodiment provides a cathodic protection test probe, including an insulating support rod 1, a sample connecting rod, a working electrode 7, a comparative sample 4, a reference electrode 5 and an auxiliary electrode 6; the sample connecting rod includes a first The sample connecting rod 2 and the second sample connecting rod 3, one end of the first sample connecting rod 2 is threadedly connected to the working electrode 7, the other end is connected to the electrochemical workstation 8 through a wire, and one end of the second sample connecting rod 3 It is threadedly connected with the comparative sample 4, and the other end is a free end; the working electrode 7, the comparative sample 4, the reference electrode 5 and the auxiliary electrode 6 are all fixed on the insulating support rod 1; the working electrode 7, the reference electrode 5 and the auxiliary electrode The electrodes 6 are all connected to an electrochemica...

Embodiment 2

[0102] like Image 6 As shown, the present embodiment provides a cathodic protection testing device, including the cathodic protection test probe described above, and also includes a test container 21, a water storage tank 22 and a circulation pump 23; the cathodic protection test probe is arranged in the test container 21, stored The water tank 22 is connected to the test container 21 through a pipeline, and both the water storage tank 22 and the test container 21 are connected to a circulating pump 23 .

[0103] The test container 21 is connected with a constant temperature control device 24 .

Embodiment 3

[0105] In this embodiment, the method for evaluating the cathodic protection effect of metals in seawater provided by the present invention is used to evaluate the general corrosion resistance of 9Ni steel when the cathodic protection potential is -0.80V. The test medium is natural seawater from Qingdao, the seawater is kept flowing, the temperature is 20°C, the reference electrode is a saturated calomel electrode, and the test time is 7 days.

[0106] Figure 7 (a) and Figure 7 (b) shows the corrosion morphology of the comparison sample and the cathodic protection sample (ie, the working electrode) after the test, respectively. like Figure 7 (a) and Figure 7 As shown in (b), the surface of the comparison sample is severely corroded, covered with reddish-brown corrosion products, and the corrosion rate is 0.2355mm / a; while the surface of the sample under the cathodic protection potential of -0.80V is smooth and metallic, and the corrosion rate is 0.0056 mm / a, the degree...

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Abstract

The invention belongs to the technical field of cathode protection test and relates to a cathode protection test probe, a cathode protection test device and a method for evaluating cathode protectioneffect of metal in seawater. The cathode protection test probe comprises an insulating support rod, specimen connecting rods, a working electrode, a contrast specimen, a reference electrode and an auxiliary electrode. The specimen connecting rods include a first specimen connecting rod and a second specimen connecting rod; one end of the first specimen connecting rod is in threaded connection withthe work electrode while the other end thereof is connected with an electrochemical workstation through a conductor wire, one end of the second specimen connecting rod is in threaded connection withthe contrast specimen while the other end thereof is a free end. The work electrode, the contrast specimen, the reference electrode and the auxiliary electrode are all fixed to the insulating supportrod. The work electrode, the reference electrode and the auxiliary electrode are all connected with the electrochemical workstation. The cathode protection test probe which is simple in structure is easy to operate, convenient to assemble and dissemble since processing such as welding, coating and further sealing to the electrode or specimen are omitted. Besides, weightlessness data are stable andreliable.

Description

technical field [0001] The invention belongs to the technical field of cathodic protection testing, and in particular relates to a cathodic protection testing probe, a device and a method for evaluating the cathodic protection effect of metals in seawater. Background technique [0002] With the development of marine development technology, the corrosion of metal materials in seawater environments such as deep-sea facilities, offshore structures, and port engineering wharves has become a key factor affecting the safe and stable operation of equipment. The main corrosion types of metals in seawater are general corrosion and local corrosion, among which, crevice corrosion is the most common among local corrosion. For the corrosion control of metal equipment in seawater environments, cathodic protection is one of the most commonly used and effective protection methods. Therefore, it is necessary to study the corrosion behavior and law of metals under cathodic protection in seaw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/02G01N17/04
CPCG01N17/02G01N17/04
Inventor 刘旭霞刘希武崔新安李朝法许兰飞李晓炜李辉
Owner SINOPEC ENG GRP CO LTD
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