Xiaodong Hao

The Research and Application of Zinc Dross Removing Robot in Galvanized Production Line

A large number of zinc dross will be produced on the surface of zinc bath, which then will be gathered and have a serious impact on strip surface quality, thus removing zinc dross and placing it in a dross container timely is a must in galvanizing production line. At present, zinc dross removal is executed performed by humans, which has many problems such as potential safety hazards, poor working conditions, difficulties in controlling dross-removal process and enterprise costs. Robotic solutions were employed to replace humans in zinc dross removal in foreign steel enterprises, which has obvious advantages in terms of safety, cost reduction and efficiency. The research of dross removal robot in domestic has just started, China iron and steel research institute and Ma-steel jointly developed a dross removal robot, with intelligent and efficient, reasonable configuration characters, which has been used successfully in Masteel.

Microstructure and Corrosion Resistance of Zn-Mg Alloy Coatings

Mg was evaporated onto GI substrate. With annealing followed, Zn-Mg alloy coating was acquired. Microstructure and chemical element of Zn-Mg alloy coatings were analyzed by SEM and EDS respectively. Anti-corrosion performance of Zn-Mg alloy coatings was studied by salt spray test (SST) and electrochemical test. Alloy phases and corrosion products were inspected by XRD. Study showed that Zn-Mg alloy phase was mainly MgZn2, MgZn, Mg2Zn11 and Mg7Zn3. The alloy coatings had excellent corrosion resistance on coating surfaces. Compared with GI, Zn-Mg alloy coatings have lower Icorr current and bigger polarization resistance. And its corrosion products are more compact.