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This is modified from a question in Paper 2 (Written Paper) of the Nov 2011 GCE O-Level Pure Chemistry Examination in Singapore. Let’s take a look at a potential question which you might be tested in the Chemistry examination.
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corrode easilyĪs such, we often use alloys instead of the pure metals.
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In general, metals have the following physical properties: Titanium and zirconium are also commonly used for making aircraft and space shuttle parts. Copper is widely used in metal wires and cables. Metals are commonly being used in our everyday lives.įor example, silver and gold are commonly used as jewellery because of their shiny appearance. The following images show the surface of the oil-contaminated metal surface before and after oxygen plasma treatment.Is Iron Man made of a Pure Metal or An Alloy? Oil and other organic contaminants can be easily removed with oxygen plasma treatment. If oxygen is used to generate plasma, rf energy can ionize the oxygen gas and cause the breakdown of oxygen molecules. Even after the surface of the metal is cleaned, it only takes a couple of hours before the airborne contaminant such as nonanal to be adsorbed onto the surface again. Lubricant oils are widely used in the manufacturing process of metal components, such as aluminum, stainless steel, and gold. Remove the organic surface contamination with oxygen plasma Lap shear strength can be increased severalfold over the traditional chemical cleaning or mechanical abrasion method.
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Oxygen and argon plasma surface treatment can significantly improve the bonding strength for adhesives on metal and composite materials. Plasma surface cleaning and treatment has been widely used to remove surface contaminations, mostly hydrocarbon type organic contamination, generate functional hydroxyl groups, and increases surface wettability. Bonding of metal to metal, composite materials, adhesive or thin coatings can be very challenging due to low surface energy, contamination, or incompatible chemistry. The strength of bonded joints is of great concern to the aerospace, automotive, medical device, and electronics industries. Tergeo and Tergeo-plus tabletop plasma cleaner