#61 FUTURE UNAVIODABLE ALLOY IN SHIPPING – 6061 ALUMINIUM ALLOY.

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In General, if you reduce 1 MT weight in Machinery space you can carry same amount of cargo. So, the Research and development works on this basic. Evolution of Metals made a key role in World War for the invention of new metals as per the industry need and requirements. In this Article we are going to discuss about the aluminium alloy, a light weight material already conquered bicycle and automobile industry. same we can expect in a couple of years in the shipping industry one the manufactures cost reduced by some alternate way of production.

An Alloy is a metal made by combining two or more metallic elements to achieve improved material properties. The process of alloying involves adding specific metallic “alloying” elements into a base metal to give it distinct properties such as increased strength, corrosion resistance, conductivity, toughness, etc., or a desired combination of these traits. Aluminium metal and its alloys are implemented in most, if not all modern industrial processes due to its wide availability and the vast number of uses. The Aluminium Association (AA Inc.) is the foremost authority on and has developed a four-digit naming system used to characterize distinct wrought alloys from one another based on their main alloying elements. In this article, 6061 aluminium alloy will be discussed in detail, highlighting its physical properties. Alloys with low percentages of alloying elements (around greater than 4%) are classified into wrought alloys and are workable, whereas those with higher percentages (up to 22%) are classified into cast alloys and are usually brittle.

Physical Properties of 6061 Aluminium

6061 aluminium alloy is heat treatable, easily formed, weld-able, and is good at resisting corrosion. The third and fourth digits are simply designators for individual alloys (note that this is not the case with 1xxx aluminium alloys).

The second digit indicates the degree of impurity control for the base aluminium. When this second digit is a “0”, it indicates that the bulk of the alloy is commercial aluminium containing its existing impurity levels, and no special care is needed to tighten controls.

Type 6061 aluminium is of the 6xxx aluminium alloys, which entails those mixtures which use magnesium and silicon as the primary alloying elements. The nominal composition of type 6061 aluminium is 97.9% Al, 0.6% Si, 1.0%Mg, 0.2%Cr, and 0.28% Cu. The density of 6061 aluminium alloy is 2.7 g/cm3.

Corrosion Resistance

The amount of corrosion resistance is dependent upon atmospheric/aqueous conditions; however, under ambient temperatures, corrosive effects are generally negligible in air/water. 6061 is particularly good at resisting corrosion from concentrated nitric acid as well as ammonia and ammonium hydroxide. The corrosive effects can be removed entirely by coating the alloy with a protective layer, to which 6061 alloy responds well. When exposed to air or water, 6061 aluminium alloy forms a layer of oxide which renders it nonreactive with elements that are corrosive to the underlying metal.

Summary

The 6061 aluminium alloy is one of the most common and versatile for extrusion. It is generally referred to as structural aluminium since its strength makes it ideal for structural applications. However, because of its good combination of properties, it can also be used in a variety of project types.

PONDICHERRY MARITIME ACADEMY

DEPARTMENT OF ADVANCED MECHANICAL AND METALLURGY ENGINEERING

Er. ABDUL RASHEED CE

Er. JAGADHISH ILANGO

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