Modularized array electrode of precision simulate welded joint and manufacturing method thereof

Abstract

The invention relates to a modularized array electrode of a precision simulate welded joint and a manufacturing method thereof. The modularized array electrode comprises three microelectrode modules: a base metal module, a welding heat affected zone module and a weld metal module, wherein the welding heat affected zone module is arranged between the base metal module and the weld metal module. According to the manufacturing method of the modularized array electrode of the precision simulate welded joint, sample preparations of a base metal zone, a welding heat affected zone, a fusion zone and a weld zone are conducted respectively, the base metal zone, the welding heat affected zone, the fusion zone and the weld zone are recombined and renatured according to the structure features of the welded joint, and therefore the array electrode is manufactured and obtained. The precision simulate welded joint is similar to an actual welded joint in structure and performance and is accurate in simulation and adjustable in area ratio. Through a modularized combination and manufacturing method, an individual test for a certain microelectrode in a certain module can be achieved, coupling tests and scan tests for a certain module or all the modules can be achieved, and the modularized array electrode is especially suitable for galvanic corrosion testing of a multielectrode system.

Description

technical field [0001] The invention relates to the technical field of corrosion electrochemical testing, in particular to a modular array electrode capable of accurately simulating actual welded joints and a preparation method thereof. Background technique [0002] Most of the pressure vessels and pipelines need to be connected by welding during installation to form an engineering system with a clear use function. In the corrosive environment of pressure vessels and pipelines, due to the inhomogeneity of the structure, composition and stress state of the material caused by welding, the welded joint composed of weld metal, welding heat-affected zone and base metal often becomes a The weakest link in the process industry and pipeline engineering. Failure accidents caused by localized corrosion of welded joints at home and abroad are common and numerous. In response to this corrosion problem, a lot of fruitful research work has been carried out at home and abroad, and the re...

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Problems solved by technology

However, since the welded joint is a typical heterogeneous multi-electrode system, the corrosion process is highly localized and changes and shifts with time, so far, the acceleration mechanism of the galvanic corrosion effect under this multi-electrode coupling condition on the localized corrosion has been rarely studied in depth and lacks some direct electrochemical evidence

Classical electrochemical testing techniques such as traditional polarization curves and electrochemical impedance spectroscopy can only obtain statistics and area-averaged electrode-solution interface information of a certain part of the welded joint, and cannot perform localized measurements or scan different positions on the electrode surface. It is more difficult to directly and accurately characterize the electrochemical information difference, distribution and dynamic change of this multi-phase, multi-interface and highly localized corrosion process, while the weld metal, welding heat-affected zone, fusion zone The multiphase coexistence with the base metal also brings great challenges to the galvanic corrosion test of welded joints. Therefore, there is still a lack of in-depth and effective research on the evolution of localized corrosion in welded joints, and the understanding of its electrochemical mechanism is also very limited. , it is necessary to develop new ideas and methods to overcome and break through the obstacles and barriers in the study of localized corrosion of welded joints, and to deeply understand and answer the effects of weld metal / fusion zone / welding heat-affected zone / base metal galvanic corrosion and its temporal and spatial evolution The key scientific question of process influence on localized corrosion of welded joints

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