Simulated accelerated corrosion testing method of ship fastener and protective coating

Abstract

The invention belongs to the technical field of marine corrosion and protection and relates to a simulated accelerated corrosion testing method of a ship fastener and a protective coating. Soaking, damp and hot, drying and salt spray tests can be carried out on different specifications of fasteners and protective coatings by using natural seawater and 5% of NaCl solution as a test medium; in situ monitoring is carried out by using an electrochemical method; and process information and corrosion test result are combined with each other so as to obtain a corrosion rule of the fastener material and the protective coating; and the method comprises the specific steps of testing device selection, specimen pretreatment, corrosion experiment circulating and test result displaying; and the method provided by the invention has the advantages of simple processing steps, safe and reliable principle, friendly test environment, small test cost, mature equipment, intuitive result display and good applicability.

Description

Technical field: [0001] The invention belongs to the technical field of marine corrosion and protection, and relates to a simulated accelerated corrosion test method for marine fasteners and protective coatings, which is suitable for simulating accelerated corrosion performance of fasteners and protective coatings in a laboratory in a marine environment Combined with the electrochemical information in the process to evaluate the environmental corrosion performance of fasteners and their protective coatings. Background technique: [0002] Seawater is a strong corrosive medium. Various steel components on ships are prone to severe corrosion in the marine environment. Among them, the corrosion of marine fasteners is one of the most prominent corrosion problems. Corrosion can easily cause fasteners The effective diameter of the fastener is significantly reduced, and the mechanical strength is greatly reduced, which seriously affects the reliability and function of the fastener c...

AI Technical Summary

Problems solved by technology

At present, the research methods of corrosion test of marine fastener materials can be divided into actual sea exposure corrosion test (also known as field test) and laboratory simulated accelerated corrosion test. The actual sea exposure corrosion test is easy to operate and can use fasteners of various sizes and shapes For the fastener, the environmental conditions of the test are basically the same as the actual use environment, which can reflect the comprehensive influence of the environment, and the test results are true and reliable. The role of environmental factors is difficult to distinguish, and the reproducibility of the test results is poor; the advantages of the laboratory simulated accelerated corrosion test are: the test conditions and environmental corrosion factors can be strictly controlled and adjusted; the test period is short; the reproducibility of the test results is good, but The seawater corrosion test inside the laboratory generally only examines the accelerated corrosion test of a single factor. For example, the Chinese invention patent with the publication number CN 101464247A describes an interleaving corrosion test method for simulating accelerated material corrosion in natural seawater, which is only applicable to simulated research materials. Corrosion law in the tidal range area; in addition, the salt spray test, as a laboratory simulated accelerated corrosion test method, can simulate the corrosion environment under the condition of high chloride ion by adjusting the solution concentration, composition, salt spray deposition amount and ambient temperature. It has a strong accelerated corrosion effect; however, it was found during the test that the corrosion phenomenon of marine fasteners and their protective coatings in the salt spray environment is quite different from the corrosion behavior under actual service conditions

The corrosion of marine fasteners and their protective coatings in the marine environment is not only the effect of a single factor, but often the interaction of multiple factors, so this method is not suitable for evaluating the corrosion of marine fasteners and their protective coatings under actual working conditions. (alternating wet and dry, seawater immersion, high temperature and high humidity, etc.) corrosion resistance

The current laboratory simulated accelerated corrosion test method mainly characterizes the corrosion performance of the material by observing the corrosion morphology of the sample and the weight loss method. It has not been combined with the electrochemical in-situ monitoring method, and the electrochemical parameters during the corrosion process cannot be obtained. The data support of the information, the reliability of the test method is low

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