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Heat Transfer during the Solidification of Hot Dip Aluminizing Coating

Chinese Journal of Mechanical Engineering 2011年第3期24卷 460-465页

作者： xiao gang shangguan qi lu yuheng huang caimin zeng jianmin Key Laboratory of Nonferrous Materials and New Processing Technology of Ministry of Education of China Guangxi University Nanning 530004 China

Hot dip aluminizing is one of the most effective methods of surface protection for steels and is gradually gaining *** the pulling speed is one of the most important parameters to control the coating thickness of aluminizing products,however,there are few publications on the mathematical modeling of pulling speed during the hot dip *** order to describe the correlation among the pulling speed,coating thickness and solidification time,the principle of mass and heat transfer during the aluminizing process is investigated in this *** mathematical models are based on Navier-Stokes equation and heat transfer *** using the self-designed equipment are carried out to validate the mathematical ***,aluminum melt is purified at 730 ℃.The Cook-Norteman method is used for the pretreatment of Q235 steel *** temperature of hot dip aluminizing is set to 690 ℃ and thedipping time is set to 3 min.A direct current motor with stepless speed variation is used to adjust the pulling *** temperature change of the coating is recorded by an infrared thermometer,and the coating thickness is measured by using image *** validate experiment results indicate that the coating thickness is proportional to the square root of pulling speed for the Q235 steel plate,and that there is a linear relationship between coating thickness and solidification time when the pulling speed is lower than 0.11 m/*** prediction of the proposed model fits well with the experimental observations of the coating thickness.

关键词： hot dip aluminizing coating model solidification heat transfer

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