Nov 24-28th, Vansko Hardware Limited had visited the most influential and the large-scale building materials industry exhibition--- The Big5 Exhibition 2019, attached people from more than 137 countries. Vansko is mainly in manufacturing stainless steel door hardware. Not only the Middle East countries like U.A.E., but also we have many customers from European countries.
After receiving the precision-cast stainless steel product and we did a Salt Fog Test after polishing , and the problem is shown in below picture.
But why does this problem occur?