How to distinguish hot dip galvanized steel plate and galvanized iron plate?

What is the difference between galvanized plate and iron plate? 1. the substrate is different iron plate, that is, ordinary iron plate, and hot rolled plate and cold binding plate. The surface of the hot rolled plate is black. Easy to rust, also known as black iron sheet. It is mainly rolled by high temperature heating. The surface of cold - rolled plate is generally white, more glossy than galvanized plate. Galvanized plate is in the ordinary iron plate after a surface - galvanized. In rust and corrosion prevention than "iron plate" strong! The appearance is better than ordinary iron plate!! Galvanized iron plate is divided into white iron sheet (the surface is white) and color steel plate (the surface has color pattern,). 2. the physical characteristics of different hot galvanized plate than iron plate corrosion resistance. Hot dip galvanized steel plate features strong corrosion resistance, good surface quality, conducive to deep processing, economic and practical. The tensile ductility of hot dip galvanized steel plate is basically less reliable than iron plate. Hot dip galvanized steel plate is not as easy to weld as iron plate, and the zinc layer will be damaged when welding. 3. The physical characteristics of the surface are different. One is galvanized white, and the other is black. Hardness is in fact the same, and the difference in the use of performance is larger, the general galvanized sheet processing is no longer processed, because the base surface has a better oxidation, and iron plate is not good, but also have to do a good job of surface paint otherwise oxidation. 4. Because of no heating in the production process of different iron plates, there is no pitting and oxide sheet defects that often occur in hot rolling. The surface quality is good and the finish is high. Moreover, the dimensional accuracy of iron plate products is generally very high, and the performance and organization of the products can also meet some special requirements, such as electromagnetic properties, deep drawing properties, etc. Galvanized sheet is a steel plate coated with zinc. Galvanizing is an economical and effective method of rust prevention, and about half of the world's zinc production is used in this process.