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Description
Flashcards by charlotte-clayto, updated more than 1 year ago
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Created by charlotte-clayto
over 10 years ago
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| Question | Answer |
| Reasons for applying a finish | - Protecting the material against corrosion - Making the product water repellent - Improving its resistance to wear and light - Improving its ability to reflect or absorb heat - Improving its ability to insulate against heat or electricity |
| Metals: Electroplating | Electrochemical process that allows ions from the coating material to form on the base material, giving it the finish of the coating material. Eg. chromium plating is used to enhance the properties of bathroom taps, kitchen equipment and vehicle components. |
| Metals: Anodising | Aluminium can be anodised, this process makes the surface of the aluminium more durable and resistant to scratches. Anodising is produced in an electrochemical cell where a sulphuric acid = electrolyte, aluminium product = anode, lead = cathode. passing and electrical current through the electrolyte builds up a tough oxide layer. |
| Metals: Enamelling | Finely ground glass formed into a water based slurry, is sprayed onto metal components, eg. cooker components. it is then fired so the coating becomes a continuous layer of heat and scratch resistant material. |
| Metals: Powder Coating | A method of applying paints to a product that has been statically charged. it is a dry process, which uses powder not paint. The powder is sprayed through an airgun that is positively charged, and the product is negatively charged, therefore there is a strong attraction between the two. Once coated the product is baked, melting the powder and producing a harder and tougher finish than paint. It is an environmentally sound method as no solvents are used and the excess can be recovered. |
| Metals: Plastic Coating | A metal component is heated to around 230 degrees. The fine plastic granules are fluidised by passing air through them, helping to provide an even coating. The product is dipped into the fluidised polymer and then removed. The heat from the product melts the plastic material, which then cools in air, providing an even coating. |
| Plastics: Self-finishing | Plastics are known as self finishing materials, therefore the quality of the mould must be very high to ensure that any trimming of flash or excess material is kept to a minimum. |
| Plastics: Self-coloured | An advantage of using plastics to manufacture products is that they can be self coloured. By including pigments with the powders or granules in the hopper of the moulding equipment, a product can be produced in the desired colour. |
| Plastics: Texture | Textures can be added to a polymer by applying the texture to the surface of the mould. This is then directly transferable to the polymer because of the way that the softened material is forced under pressure into every part of the mould. This process will add expense in the production of the mould. |
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