Resistant Materials Coursework

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Resistant Materials Coursework

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Resistant Materials Coursework Excerpts

Magnesium is another metal, lighter than aluminum, which is extensively used in the light alloys. However, magnesium as a construction metal itself has so far been quite disappointing because of its wayward persistence in corroding either by itself or in its alloys. If the generalization that the purest metals do not corrode readily is true, then strictly pure magnesium should be very much better than that which is not quite pure. Until recently developments along the line of the production of noncorroding magnesium have been quite discouraging. Experimental work has been done with magnesium metal which has been redistilled in a vacuum out of the presence of oxygen. There are indications that this metal may become one of the strictly corrosion resistant materials. It is also significant to note that the most corrosion resistant aluminum alloy is that which contains 10 percent of magnesium.

Recent years have seen the advent of the so-called "stainless steels" in the metal industries. The first man to invent a stainless metal that could be used for tools was Haynes, of early automobile fame, but his material was not a steel. It was an alloy of cobalt, chromium, and tungsten. It is very tough, retains its properties at red heat and is used as a cutting tool material. It does not corrode, but it is very expensive. This was followed by Brearly's making of a satisfactory stainless steel in England. The most successful material which was relatively inexpensive (though it still costs 20 to 30 cents per pound) and which was practically noncorrosive in the atmosphere, was the so-called "18 and 8 stainless steel" invented in Germany and covered by the Strauss patents. This material has had a truly phenomenal development in this country as well as abroad. It has been the subject of much licensing and many litigations. There are several hundred patents involving modifications of this original Krupp development. The basic patents expire within the next year and the cessation of royalties may tend to bring the price down slightly. Probably the greatest mass exhibition of stainless steel in this country is on the outside of the Chrysler Building in New York City. It is standing up very well under the trying atmosphere in which it is immersed. Even this material has its drawbacks. It offers but very little opposition to the corrosive action of salt water. The United States Navy had some irritating experiences with the corrosion of stainless steel used as gasoline tanks in which salt water displaced the fuel.

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