Japan's largest galvanizing and processing capacity of zinc alloy plating


Shinwa Eco plating

The processing capacity of our zinc plating and zinc alloy plating equipment is the largest in eastern Japan, and the stable uniformity of our color tone (especially trivalent chromate) is also highly regarded.

We constantly check for corrosion resistance using our in-company salt spray tests to deliver products with assured quality.

Shinwa Eco typical plating types

Zinc plating

Zinc plating uses a pollution-free acidic bath or an alkaline bath, and these are separately selected according to the size, length and heat treatment differences of the plated products.

Corrosion resistance is further improved by generating a trivalent chemical conversion coating film on the zinc plating which is inexpensive and has good corrosion resistance. Zinc plating offers the best balance of function, appearance quality and cost, and mass production is possible, so it is widely used for plating general parts such as automobile parts and industrial machinery.

→ Click here for details

Zinc-iron alloy plating: Strontium zinc

Alloying 0.3 to 0.6 wt% of iron with the zinc suppresses excessive sacrificial corrosion losses of the zinc, and thus dramatically increases the time it is protected against corrosion. This enables 3 to 4 times more corrosion resistance than is possible with ordinary zinc plating.


Click here for details

Zinc-nickel alloy plating

Zinc-nickel alloy plating is a plating process with excellent corrosion resistance. There are two types: medium nickel-zinc alloy plating and high nickel-zinc alloy plating.


Click here for details