Sherardizing is the formation of a corrosion-resistant, zinc-iron alloy coating, on the surface of steel or iron.
The method involves the heating of the object in an airtight container that has zinc powder.
A thermal diffusion process occurs and the zinc diffuses into the object’s metal surface, forming the zinc-iron alloy.
Galvanizing is a process of coating zinc by hot dipping.
Anodizing is an electrochemical process that converts the metal surface into a decorative, durable, corrosion-resistant, anodic oxide finish.
Aluminum is ideally suited to anodizing, although other nonferrous metals, such as magnesium and titanium, also can be anodized.
old chisels are forged to shape and hardened and tempered at the cutting edge. Although the vast majority of cold chisels are made of steel, a few are manufactured from beryllium copper, for use in special situations where non-sparking tools are required.
Cold chisels are made from carbon tool-steel, which is usually octagonal in cross-section.
Tool-steel is used as it can be hardened to form a hard and tough cutting edge.
To make a cold chisel heat the end of the bar of tool steel until it is bright red and hammer to the desired shape.