Galvanic corrosion simulation test device and method for composite steel bar coating and core material

Abstract

The invention relates to a galvanic corrosion simulation test device and method for a composite steel bar coating and a core material. The device comprises a box body, a swing clamp A, a swing clamp B, a zero-resistance galvanometer, a temperature measuring electrode, a heater and a control system, wherein a core material sample and a composite steel bar sample are respectively fixed on the swingclamp A and the swing clamp B, and the top ends are connected with the zero-resistance galvanometer through wires; a corrosive solution is contained in the box body, and the core material sample and the composite steel bar sample can swing between a horizontal state and a vertical state; the core material sample and the composite steel bar sample are not in contact with the corrosive solution whenin a horizontal state; when the composite steel bar sample is in a vertical state, the coating material exposed out of the middle of the composite steel bar sample is completely immersed in the corrosive solution. The phenomenon of galvanic corrosion between the core material and the coating after the coating material of the composite steel bar sample is subjected to pitting corrosion can be simulated, the coupling potential and the coupling current can be measured in real time, and the corrosion rate of the core material and the pitting corrosion depth of the core material can be comprehensively evaluated.

Description

technical field [0001] The invention relates to the technical field of galvanic corrosion experiments, in particular to a galvanic corrosion simulation test device and method for composite steel bar cladding and core materials. Background technique [0002] At present, a large number of carbon steel bars used in ordinary reinforced concrete structures are easily corroded in seawater or humid corrosive environments, resulting in a decrease in the strength of the facility structure and seriously affecting the service life of the facility structure. In order to change the above situation, stainless steel bars have been introduced in recent years, but due to the high price of stainless steel bars, their popularization and application in common facility structures has been limited. In this context, composite steel bars, as an emerging material, have become a new research direction in the industry. [0003] In the use of composite steel bars, an important issue that must be consi...

AI Technical Summary

Problems solved by technology

[0003] During the use of composite steel bars, an important issue that must be considered is galvanic corrosion. Galvanic corrosion exists in many industrial devices and engineering structures. It is the most common type of localized corrosion and is often difficult to predict and prevent. Cause components to fail suddenly without warning, destroying the reliability of the structure

The cladding material of the composite steel bar is usually a corrosion-resistant metal, which has a high corrosion potential. Once corroded and perforated, the core material will be exposed to the medium. Due to the galvanic corrosion effect of the large cathode and small anode, the self-corrosion potential is relatively negative. The corrosion rate of the core material increases sharply, which leads to the corrosion failure of the composite steel bar

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