Q345 steel surface powder embedding aluminizing process in air environment

Abstract

The invention discloses a Q345 steel surface powder embedding aluminizing process in an air environment. The Q345 steel surface is aluminized in the air environment by adopting a solid powder embedding method. An aluminized layer with high hardness and corrosion resistance is prepared on the surface of the Q345 steel. The influence of the aluminizing temperature and the heat preservation time on the surface quality of an aluminized layer sample and the thickness of the aluminized layer is researched, and the optimal aluminizing condition is determined. An electron microscope is used for observing the surface quality of the aluminized layer and measuring the thickness of the aluminized layer, an energy dispersive spectrometer is used for analyzing distribution of main elements of the aluminized layer, an X-ray diffractometer is used for analyzing phase composition of the aluminized layer, and a microhardness tester is used for detecting hardness change of the aluminized layer. Results show that when the heat preservation time is 3 h, a compact infiltrated layer with the infiltrated layer thickness of about 180 microns is obtained at the heating temperature of 800 DEG C, the surface quality is good, and the hardness and corrosion resistance are excellent. The complex process problem that a vacuum environment or a protective atmosphere is needed in the powder embedding aluminizing process is solved.

Description

technical field [0001] The invention relates to the technical field of surface aluminization of Q345 steel, in particular to a powder-embedded aluminization process on the surface of Q345 steel in an air environment. Background technique [0002] Carbon steel is widely used in the industry to manufacture metal components and equipment because of its good mechanical properties, low cost, and a certain degree of corrosion resistance to certain corrosive media. About 80% of petroleum and chemical equipment are made of ferroalloy. However, there are many corrosive media in the process of petroleum and chemical production. Under many working conditions, carbon steel will greatly reduce the service life of equipment and pipelines due to corrosion. Therefore, in recent years, in the field of surface engineering technology, metal chemical heat treatment technology has been used to modify the surface of carbon steel to improve its performance in terms of corrosion resistance, high t...

AI Technical Summary

Problems solved by technology

In 2016, Meng Lei et al. reviewed the research progress of carbon steel powder embedded low-temperature aluminizing process, indicating that the current research on carbon steel powder embedded low-temperature aluminizing process has achieved gratifying research results. The surface mechanical energy assisted infiltration method realizes carbon steel powder embedded low-temperature aluminizing, and there is still great potential to be developed

[0004] Although the current research can obtain aluminized layer with better quality, the equipment requirements are relatively high, and the operation is not easy and the cost is high.

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