Stainless steel is the generic name for a number of different steels used primarily for their resistance to corrosion. The one key element they all share is a certain minimum percentage of chromium of 10.5%. Although other elements, particularly nickel and molybdenum, are added to improve corrosion resistance, chromium is always the deciding factor. However, despite its various additions stainless steel still behaves as steel, and even the highly alloyed stainless steel grades such as 316 still contain a minimum of 62% iron.
PNZ manufactures using 304 grade stainless steel with an electro-polished (EP) finish brushed finish. Electro-polishing is widely used in the electronics, food and medical industries and on components for cruise ships and yachts, where a corrosion resistant, smooth and easy to maintain surface is of vital importance. Electro-polishing is an electrochemical process whereby the combination of an electrical current and a strong acid erodes the surface of the stainless steel substrate atom by atom. This process removes much of the iron from the surface of the steel, but leaves the chrome intact, resulting in more shiny, but much improved corrosion resistant surface.
Stainless steel is generally resistant to corrosion. Natural hazards such as dust and moisture in the air can attack the finish on this type of outdoor furniture. A regular cleaning of stainless steel frames is required on a monthly basis to remove the natural deposits, salts. Use fresh water only; spray the frames down thoroughly at a high hose pressure. A soft dusting cloth can then be used to enhance the surface. The brushed finish of stainless steel can be maintained yearly with a non-abrasive cleaner.