Film: 9387

Aviation | 1970 | Sound | Colour

Clip:

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Synopsis:

Corrosion in aircraft with the Royal Air Force. Vulcan bomber. Car scrap yard 1970's

Close up of rusty scrap metal at a scrapyard. Three wider shots of various piles of scrap at the scrapyard. Close up of more scrap, it zooms out and scrolls to the right to show a middle-aged man (the narrator) in a brown bomber jack stood in front of a pile of scrap cars, the man walks up to the camera and tells us how we experience corrosion of metal in various capacities in our life. Close up of the man, he explains that in the presence of water and air, metals corrode, the camera scrolls to the scrap metal seen at the start. Another close up of rusty metal. Shot looking down on a rusty car, the camera zooms in on the roof and “Corrosion in Aircraft” appears in white text, the text “corrodes” away after a few seconds. Wide shot of an Avro Vulcan bomber being serviced in a large hangar, the aircraft is surrounded by scaffolding, and is painted in the typical dark green/grey camouflage, various workers are milling about the hangar and a forklift drives about, the narrator explains that the service of a Vulcan can take 2500 man hours. View of a C-130 Hercules in a grey paint, the narrator tells us a Hercules service takes 4000 man hours. View of a Hawker Sidley Nimrod being serviced in a hangar, which can take 5000 man hours, and cost millions per year. The narrator is now sat behind a lab bench wearing a black suit, with another bench filled with bottles of chemicals behind him; there are various instruments on the table in front of him. Close up of the narrator holding two metal electrodes, one fo steel and one of aluminium alloy, he places them into a dish of water. He connects a wire to each metal, and the camera scrolls to a galvanometer (ammeter), which shows a value of 0.02 mA, the narrator explains a current is flowing. Close up of the narrator, he explains this is “galvanic action”, and that one of the metals will eventually be eaten away. Close up of the narrator placing the metals in a deeper dish of salt water. Close up of the galvanometer, which rapidly increases in current. Close up of the metal in the salt solution. A graphic of metals with their “Potential in volts” is shown in white on a blue background; each metal is placed on a scale between +0.5 and -2. The narrator explains that the higher the difference in potential between the 2 metals, the better the current in the cell, and that the lower potential metal corrodes. The narrator stands up and picks up a steel fastening bolt from the table. Close up of him holding the fastener, he places it next to others in an Aluminium sheet, and explains that even without the presence of water, they will corrode. Wide shot of him holding the sheet. Close up of the narrator holding a piece of Aluminium. Wide shot, he explains that small differences in composition of the metal can cause corrosion in just a single metal piece. Close up of the Aluminium being placed a salt solution. Another close up of the aluminium, the narrator explains that discrepancies in the concentration of the solution can also lead to a cell forming and corrosion taking place. This shot is time-lapsed over 2 days, and the right side of the block produces many bubbles but the left is clean. Close up of the block being removed from the dish with a pair of tweezers, the right side of the metal has rusted. The narrator holds the Aluminium, and tells us it is fortunate that corrosion does not happen this fast in reality. Close up of rusty metal, the narrator moves his hand over the metal and describes this as “surface corrosion”. Wide shot showing the narrator stood next to the rusty metal on a table. Close up of the narrator running his finger over the edge of a piece of metal, there are rough patches on the edge and the narrator explains this is another type of corrosion. Close up of a sheet of metal, the small 2dimple” corrosion is also seen. The narrator picks up a large green sheet of metal. Close up of the metal, it has cavities in it, the narrator explains that trapped water between 2 sheets of metal leads to this. Close up of the narrator removing a bolt from a metal panel and removing the panel, revealing large amounts of corrosion between the plates. Close up of the narrator holding the 2 pieces of a snapped metal sheet with holes in it, and explains this is due to corrosion. Close up of the narrator, he explains a dangerous form of corrosion is “intergranular corrosion”, as it is hard to detect from the outside of the metal, he picks up a piece of metal. Close up of the metal, there are “flakes” peeling off it, he explains this is an extreme case. Close ups of various corroded pieces of metal. Graphic showing 2 jagged layers of metal moving past each other, and causing wear, the narrator explains this is another form of corrosion “fretting corrosion”. Close up of more corroded metal, the narrator explains “microbiological corrosion” can occur in fuel tanks. Close up of the narrator, the shot zooms out to show all of the corroded metal on the table, the narrator explains all these forms of corrosion can be dangerous to an aircraft. Close up of the narrator, he tells us corrosion is much more dangerous when the metal is under stress. A large crack is seen in a sheet of metal, the narrator explains that this is “Stress Corrosion Cracking”. Close up of a half of a broken metal pipe. Wide shot of the narrator holding the pipe, he explains the effect of SCC is more that just the combined effects of fatigue and corrosion. Close up of the narrator again; he reiterates how the effects are hard to see on the surface until it is too late. Wide view of a large hangar, workers are walking about and various jets (harriers) are being worker on in the background, the camera pans right to show the narrator standing on scaffolding next to a jet with open panels, showing the machinery inside, the narrator explains that the right materials for aircraft must be chosen so that they don’t corrode. Close up of the narrator talking. 2 workers in brown overalls are inspecting the cockpit of a jet. The narrator moves up to the nose wheel of the jet and spins the wheel (the aircraft is suspended off the ground using scaffolding), the camera zooms in on the wheel as he explains the wheel is made of magnesium, which corrodes easily, so magnesium can only be used where the component is easily inspected.


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