Wear-resistant stainless steel plate
No matter whether the metal friction pair in the corrosive medium has corrosion resistance or not, it bears the joint action of corrosion and wear, and is likely to lead to the accelerated deterioration of its corrosion resistance and wear resistance.
Seawater is a typical corrosive medium in nature. It is of great significance to study the synergistic mechanism between corrosion and wear of materials in the Marine environment.
Corrosion and wear of metal materials in seawater immersion zone are very complex, including turbulent corrosion, erosion corrosion and sliding corrosion. There are many researches on turbulent corrosion and erosion corrosion, and the relevant mechanism is very clear. And sliding corrosion wear is also full immersion zone typical loss model of metal materials, such as chain link between the wear corrosion is the sliding wear, but the related mechanism is not clear, full immersion study area of the metal material corrosion wear of metal materials in seawater corrosion wear mechanism is discussed as well as the corrosion and wear resistant materials research and development is of great significance.
The corrosion wear behavior of 304 stainless steel in artificial seawater was studied by synchronous electrochemistry/pin-plate friction wear test. Tribology, electrochemistry and tribology were used to analyze and discuss the degree and mechanism of interaction between corrosion and wear.
The commonness and characteristics of corrosion and abrasion in seawater were discussed.
In this paper, by means of electrochemical analysis, surface morphology and composition analysis, quantitative calculation and theoretical simulation methods, the comprehensive evaluation of various experimental conditions and influence factors on the 304 stainless steel corrosion and wear behaviour, based on a large number of research data to draw the corresponding corrosion wear figure, for 304 stainless steel provides a forecast based on failure mode and the damage rate.
The results show that martensite phase and mechanical twins are formed on the friction surface of 304 austenitic stainless steel due to stress concentration in the sliding friction process. The martensite phase and austenite parent phase form microscopic corrosion couple in the grinding mark and accelerate the activation and dissolution of 304 stainless steel.
Mechanical factors will affect the amount of martensitic transformation. Under low load and low speed, the longer the friction time is, the more martensitic content in the abrasion mark of 304 stainless steel is, and the greater the influence on the corrosion and wear behavior of the metal is.
Seawater pH also affects the corrosion and wear behavior of 304 stainless steel. In the environment of high pH, seawater shows good lubricity and low corrosion, so 304 stainless steel shows low corrosion and wear rate in the seawater of high pH.
The corrosion and wear behavior of 304 stainless steel is also affected by the concentration of halogenated ions. The high concentration of halogenated ions improves the lubricity of seawater and reduces the wear rate, but at the same time increases the corrosion of seawater to metal, especially the pore corrosion sensitivity of 304 stainless steel.
In addition, the greater the initial surface roughness of 304 stainless steel, the longer the run-in time, the more serious the abrasive wear.
Anodic external potential will accelerate the corrosion of 304 stainless steel, change the contact surface characteristics, improve the corrosion wear rate. By comparing 304 stainless steel with other alloys, it can be found that the corrosion and wear behaviors of three kinds of austenitic stainless steels with different stable states are not very different.
Among the steel materials with different microstructure, 410 martensitic steel has the lowest corrosion wear rate, and its wear mechanism is mainly abrasive wear and adhesive wear. Copper alloy in nonferrous metals has the best corrosion resistance in seawater and is superior to other steel materials.
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