Describe the procedures for the hot process, anodising and plating methods outli

Question

Describe the procedures for the hot process, anodising and plating methods outlined below when used for finishing on different given components: What effect will these processes have on the finished component, surface finish and hardness? Outline key health and safety considerations of each process. For hot process the component is made from steel dipped in molten tin For anodising the component is an aluminium window frame. Also describe how colour is added in the process. For plating the component is zinc plated.

Explanation / Answer

Solution:

Hot working is the process where metals are plastically deformed above their recrystallization temperature. In this process, material is heated above recrystallization temperature & it is plastically deformed which results in strain hardening, which ultimately keeps the yield strength and hardness low and ductility high for the material.Basically it is used to refine the matrial with re growth of crystals.

Anodising is the process used for coating of electrode. This process is called anodising because the electrode which needs to be cover is made as anode in electrical circuit. This process is mainly used to protect the material from corrosion by providing coating of any other metal, For eg iron can be protected from corrosion by coating of zinc.

Procedure for anodising is

Make the electrode anode by connecting to positive terminal which needs to be anodised or coated. Then other electrode will be cathode.Put the electrode inside electrolyte solution to accelerate the process. On passing current through circuit, anodising will start.

Platting method is similar to anodising. Here material to be coated will be cathode electrode & on which material to caoted will act as anode and rest of the process will be same.Its wide application is in jewellery.

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