_______ is a process for placing a thin phosphate coating on steel.

Explanation

Explanation: Parkerizing It is a process of applying an anti-corrosion and lubricating phosphatized surface treatment. Parkerizing is an electrochemical process that creates a protective iron- phosphate layer on the outer surface of steel. Parkerizing, bonderizing, phosphating, or phosphatizing is a method of protecting a steel surface from corrosion and increasing its resistance to wear through the application of a chemical phosphate conversion coating. Parkerizing is usually considered to be an improved zinc or manganese phosphating process. Parkerizing is commonly used on firearms as a more effective alternative to protect against rust. It is also used extensively on automobiles to protect unfinished metal parts from corrosion. The Parkerizing process cannot be used on non-ferrous metals such as aluminium, brass, or copper. It similarly cannot be applied to steels containing a large amount of nickel, or on stainless steel. Important Points Galvanization In this method, a thin layer of zinc is applied to prevent corrosion of iron or steel. For example, shining iron nails, pins, etc. It is done to protect the metal from saltwater corrosion. Anodizing It is used to provide a decorative and corrosion-resistant coating on aluminium and its alloys only. Anodizing is an electrochemical process that converts the metal surface into a decorative, durable, corrosion-resistant, anodic oxide finish. Aluminium ideally suited to anodizing, although other non-ferrous metals, such as magnesium and titanium.