Test method for simulating couple corrosion in seawater scouring environment

A technology for galvanic corrosion and testing methods, which is applied in the fields of weather resistance/light resistance/corrosion resistance, measuring devices, instruments, etc., and can solve the problems of galvanic corrosion test methods and technical equipment, and sink type scouring. Equipment and other issues, to achieve the effect of simple and reliable test principle, improved test device and process, good calculation and applicability

Inactive Publication Date: 2010-12-22
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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Problems solved by technology

At present, in the field of seawater scouring environmental corrosion test and test research, there is no reference to the same or similar technical records of the sink type sco

Method used

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  • Test method for simulating couple corrosion in seawater scouring environment
  • Test method for simulating couple corrosion in seawater scouring environment
  • Test method for simulating couple corrosion in seawater scouring environment

Examples

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Embodiment

[0016] Each split structure of the test device system used in this embodiment includes a test sample anode A, a test sample cathode C, a resistance module R, a seawater inlet 1, a seawater pump 2, a flexible pipe 3, a ball valve 4, and a flow meter 5 , PVC pipe 6, flowing water tank 7, test tank 8, seawater outlet 9, wire 10, reference electrode 11, sample card slot 12, PVC support bar 13, wire 14, reference electrode SCE15, PVC support bar 16, The flow-type test tank 17 and seawater 18 are combined and connected in principle at each test stage respectively to form a flow-type tank scouring corrosion test device; the implementation of this embodiment first introduces seawater 18 from the water storage tank through the seawater inlet 1 by the seawater pump 2, The seawater 18 enters the flowing water tank 7 through the flexible pipe 3, the ball valve 4, the flow meter 5 and the PVC pipe 6, and then flows into the water storage tank through the seawater outlet 9, so as to realize ...

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Abstract

The invention belongs to the technical field of marine corrosion tests, and relates to a novel test method for testing couple corrosion in a seawater scouring environment. The method comprises the following steps of: preprocessing test samples by using a flowing type water trough scouring corrosion experimental device, making test sample installing stages rightly opposite in pairs, and supporting the test sample installing stages with PVC supporting bars, wherein the test sample installing stages are closely attached to the walls of an experimental trough and are fixed on the two sides of the experimental trough; starting a seawater pump, regulating the flow rate of the seawater pump with a frequency converter so as to meet test requirements, and connecting each group of couple pair test samples after the water flow becomes stable; performing the experimental test of simulating an electrical insulation state under the condition of directly connecting two wires or loading a resistor; and testing and recording the numerical values of material potentials, coupling potentials and coupling currents of the test samples, photographing and washing and weighing corrosion products respectively, computing the couple corrosion rate of the materials, and drawing coupling potential-time curves. The method has the advantages of simple and reliable test theory, safe used equipment, accurate test parameters and high computability and applicability.

Description

Technical field: [0001] The invention belongs to the technical field of marine corrosion testing and relates to a novel simulated galvanic corrosion test method under seawater scour environment conditions. The test method can obtain corrosion data and galvanic corrosion performance parameters of various materials in the seawater scour environment. Background technique: [0002] Seawater is a highly corrosive medium, which is likely to cause serious corrosion of metal structures, facilities and equipment in contact with it. The seawater condensing pipeline system of ships and the seawater circulating water system of coastal power plants are corrosion-prone areas. The survey shows that dissimilar metals Galvanic corrosion caused by contact is one of the important causes of leakage in piping systems. In order to prevent the harm of pipeline material corrosion to the system, it is very necessary to study the behavior and law of galvanic corrosion, and take effective control meas...

Claims

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Application Information

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IPC IPC(8): G01N17/02
Inventor 李宁王洪仁许立坤
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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