（1）Tin-Zinc Alloy Plating

It is said to have excellent corrosion resistance characteristics against salt water and moist atmosphere, especially, tin at 70% supposedly shows the highest corrosion resistance. It has good solderability and can be directly plated on aluminum.
Since tin is more expensive compared to zinc, it will inevitably be more costly. In order to counter this, multiple plating layer methods where conventional zinc plating or chromate treatment are deposited over a several micro-meters of tin-zinc alloy plating are employed.

（2）Cadmium Plating

Although this was formally a popular anti-corrosion plating along with zinc plating, the occurrence of Itai-Itai disease from cadmium has caused the shift towards zinc and other plating types.
However, the cadmium plating has exceptional corrosion resistance ability against seawater, and the chromate treatment has good solderability, thus it is still persistently high in demand in aerospace, nautical vessel components, electrical components industries.