[Table 1] shows the electroplated steel sheets.

[Table 1] Electroplated steel sheets

Compared to hot-dip galvanized steel sheets, electro-galvanized steel sheets are produced with less plating deposited. For its evenly deposited surfaces, better workability and aesthetic finish, electro-galvanized steel sheets are adopted in various fields.For applications requiring even superior corrosion resistance, increasing the amount of plating deposited is one of the options. However, doing so will adversely affect the workability and weldability.
To resolve such issue, electro-galvanized alloy plating was developed.This type of steel sheets has enhanced corrosion resistance, superior painting, weldability, and stamping workability with less electroplating deposited.Zn-Ni based and Zn-Fe based plating is the most common type of alloy plating.Zn-Ni based plating contains 10 to 13% of nickel. Compared to pure zinc, this material can withstand extremely corrosive conditions. Even without the extra coating, the corrosion products having the superior anti-corrosion properties can prevent the corrosion to progress further.To improve the corrosion resistance further, composite films with organic coating applied over plating have been developed recently.
Steel sheets with Zn-Fe based plating applied contain 10 to 30% of steel. The main purpose of using steel is to improve the corrosion resistance after plated sheets are treated with additional coating.Double-layer zinc alloy plated steel sheets are formed by flash-plating Fe-Zn or Fe-P over the Fe alloy layer. The double-layer sheets have superior electrodeposition than the Zn-Fe based steel sheets.