Method for measuring corrosion potential of offshore steel structure

Abstract

The invention relates to the technical field of corrosion potential measurement methods, and provides a corrosion potential measurement method for an offshore steel structure, which is used for directly testing the corrosion potential of the offshore steel structure on a mother ship and can improve the efficiency and the working quality, and comprises the following steps of: connecting a measurement instrument with a large steel structure; a measuring end is led out from the surface of a large steel structure and connected with the negative electrode of a measuring instrument, the measuring instrument is connected through independently introducing a wire from the interior of a cable shaft, and one end of the wire is connected with a reference electrode on an ROV, so that the measuring instrument is connected with the reference electrode, an underwater robot is controlled, the reference electrode is brought to a set position, and ROV wiring and power supply are completed. The ROV body is put into water through a crane, the robot is controlled through an operation handle on the control box, the reference electrode is determined to be brought to a set position through ROV display data on a display screen of the control box, the potential difference of the two terminals is read through the measuring instrument, and the control box reads and displays the numerical value read by the measuring instrument.

Description

Technical Field

[0001] The invention relates to the technical field of corrosion potential measurement methods, and in particular to a method for measuring the corrosion potential of an offshore steel structure. Background Art

[0002] The steel structure foundation of offshore wind power is in the marine environment and is susceptible to environmental corrosion. Usually, the steel structure foundation of offshore wind power is protected by sacrificial anode or impressed current method. By measuring the corrosion potential of the offshore wind power foundation, the protection status of the steel structure can be evaluated. The traditional measurement method requires divers to carry a corrosion potential meter and dive underwater. The meter is in contact with the steel structure foundation to measure the corrosion potential. This method is not only time-consuming, but also has certain risks. In addition, it is difficult for divers to access some complex structural parts.

[0003] Therefore, we proposed a method for measuring the corrosion potential of offshore steel structures to solve the above technical problems. The reference electrode is brought below the sea surface by an underwater robot, and the corrosion potential of the offshore steel structure is directly tested on the mother ship. There is no need for operators to carry a corrosion potential measuring instrument underwater. The reference electrode can be brought to places that are difficult for divers to enter through the underwater robot, making the measurement safer and more convenient. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the shortcomings of the prior art, the present invention provides a method for measuring the corrosion potential of offshore steel structures. In fact, the corrosion potential of offshore steel structures is directly tested on the mother ship, which makes the measurement safer and more convenient, and can also improve efficiency and work quality.

[0006] (II) Technical solution

[0007] To achieve the above object, the present invention provides the following technical solutions: A method for measuring the corrosion potential of an offshore steel structure, comprising the following steps:

[0008] Step S1: The negative electrode of the test lead of the measuring instrument is connected to the large steel structure;

[0009] Step S2: Connect the positive electrode of the test lead of the measuring instrument to the reference electrode;

[0010] Step S3: Control the underwater robot to bring the reference electrode to the set position;

[0011] Step S4: the measuring instrument reads the potential difference between the two terminals;

[0012] Step S5: The control box reads the value read by the measuring instrument and displays it;

[0013] Step S6: After the measurement is completed, the robot is recovered.

[0014] Preferably, in step S1, a measuring terminal is led out from the surface of the large steel structure and connected to the negative pole of the measuring instrument.

[0015] Preferably, in step S2, a separate wire is introduced from the inside of the cable shaft, and one end of the wire is connected to a reference electrode on the ROV.

[0016] Preferably, step S3 comprises:

[0017] Step S31: Complete ROV wiring and power supply;

[0018] Step S32: placing the ROV body into water via a crane;

[0019] Step S33: controlling the robot through the operating handle on the control box;

[0020] Step S33: Determine that the reference electrode is brought to the set position through the ROV display data on the control box display screen.

[0021] Preferably, the control box in step S5 includes a computer host, three display screens and an operating handle, and the three display screens respectively display ROV status data, underwater video data and image sonar data; wherein the underwater video data and image sonar data can be used to display the relative position with large structural parts, as well as current water depth and other data.

[0022] Preferably, in step S5, the control box reads and displays the value read by the measuring instrument through the 485 communication interface, and the control box and the measuring instrument are both placed on the mother ship.

[0023] (III) Beneficial effects

[0024] Compared with the prior art, the present invention provides a method for measuring the corrosion potential of an offshore steel structure, which has the following beneficial effects:

[0025] In the present invention, an underwater robot is used to bring a reference electrode below the sea surface, and the corrosion potential of the offshore steel structure is directly tested on the mother ship. There is no need for operators to carry a corrosion potential measuring instrument and dive underwater. In addition, the reference electrode can be brought to a place that is difficult for people to enter by the underwater robot, so that the measurement is safer and more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a flow chart of the method for measuring corrosion potential of offshore steel structures in an embodiment of the present application;

[0027] Figure 2 Schematic diagram of the underwater robot system in the embodiment of the present application. DETAILED DESCRIPTION

[0028] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0029] Example

[0030] See also Figure 1-Figure 2 , a method for measuring corrosion potential of an offshore steel structure, comprising:

[0031] Step S1: The negative electrode of the test lead of the measuring instrument is connected to the large steel structure;

[0032] In the embodiment of the present application, the measuring instrument is connected by leading out a measuring end from the surface of the large steel structure and connecting it to the negative pole of the measuring instrument.

[0033] Step S2: Connect the positive electrode of the test lead of the measuring instrument to the reference electrode;

[0034] In the embodiment of the present application, the connection between the measuring instrument and the reference electrode is achieved by introducing a wire from the inside of the cable shaft, one end of which is connected to the reference electrode on the ROV;

[0035] Step S3: Control the underwater robot to bring the reference electrode to the set position;

[0036] Specifically, step S3 includes:

[0037] Step S31: Complete ROV wiring and power supply;

[0038] Step S32: placing the ROV body into water via a crane;

[0039] Step S33: controlling the robot through the operating handle on the control box;

[0040] Step S33: Determine that the reference electrode is brought to the set position through the ROV display data on the control box display screen;

[0041] Step S4: the measuring instrument reads the potential difference between the two terminals;

[0042] Step S5: The control box reads the value read by the measuring instrument and displays it;

[0043] In the embodiment of the present application, the control box includes a computer host, three display screens and an operating handle, and the three display screens respectively display ROV status data, underwater video data and image sonar data; the underwater video data and image sonar data can be used to display the relative position with large structures, as well as current water depth and other data.

[0044] In the embodiment of the present application, the computer-side reading is that the control box reads the value read by the measuring instrument through the 485 communication interface and displays it, and the control box and the measuring instrument are both placed on the mother ship.

[0045] Step S6: After the measurement is completed, the robot is recovered.

[0046] The above specific implementation methods are only for illustrating the technical concept and structural features of the present invention, and the purpose is to enable relevant persons familiar with this technology to implement it. However, the above content does not limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should fall within the protection scope of the present invention.

Claims

1. A method for measuring corrosion potential of offshore steel structures, characterized in that: The steps include: Step S1: The negative electrode of the test lead of the measuring instrument is connected to the large steel structure; Step S2: Connect the positive electrode of the test lead of the measuring instrument to the reference electrode; Step S3: Control the underwater robot to bring the reference electrode to the set position; Step S4: the measuring instrument reads the potential difference between the two terminals; Step S5: The control box reads the value read by the measuring instrument and displays it; Step S6: After the measurement is completed, the robot is recovered.

2. A method for measuring corrosion potential of offshore steel structures according to claim 1, characterized in that: In the step S1, a measuring terminal is led out from the surface of the large steel structure and connected to the negative electrode of the measuring instrument.

3. A method for measuring corrosion potential of offshore steel structures according to claim 2, characterized in that: In step S2, a conductor is introduced from the inside of the cable shaft, and one end of the conductor is connected to a reference electrode on the ROV.

4. A method for measuring corrosion potential of offshore steel structures according to claim 3, characterized in that: The step S3 comprises: Step S31: Complete ROV wiring and power supply; Step S32: placing the ROV body into water via a crane; Step S33: controlling the robot through the operating handle on the control box; Step S33: Determine that the reference electrode is brought to the set position through the ROV display data on the control box display screen.

5. A method for measuring corrosion potential of offshore steel structures according to claim 4, characterized in that: In step S5, the control box includes a computer host, three display screens and an operating handle, and the three display screens respectively display ROV status data, underwater video data and image sonar data; wherein the underwater video data and image sonar data can be used to display the relative position with large structural parts, as well as current water depth and other data.

6. A method for measuring corrosion potential of offshore steel structures according to claim 5, characterized in that: In step S5, the control box reads and displays the value read by the measuring instrument through the 485 communication interface, and the control box and the measuring instrument are both placed on the mother ship.

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