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Home  > Raw materials & technologies  > Applications  > Protective & Marine coatings  > Sweet and “green”: date palm juice could s...

Wednesday, 18 September 2019
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Raw materials & technologies, Applications, Protective & Marine coatings

Sweet and “green”: date palm juice could serve as corrosion-inhibitor

Monday, 15 October 2012

Husnu Gerengi from Duzce University in Turkey found that the juice of the date palm could be used as a new "green” anti-corrosive agent for aircraft and cars.

Date palm juice could be used as corrosion-inhibitor for aluminum used in planes and cars

Source: Anyka/ Fotolia.com

Date palm juice could be used as corrosion-inhibitor for aluminum used in planes and cars

Source: Anyka/ Fotolia.com

The search for a "greener" way to prevent corrosion on the kind of aluminum used in jetliners, cars and other products has led scientists to an unlikely source: they are making use of the juice of the date palm - those tall, majestic trees that, until now, were noted mainly as sources of food and traditional medicines.

Husnu Gerengi, researcher at Duzce University, Turkey, points out that strong, lightweight aluminum alloys are used to make planes, cars and industrial equipment. Aluminum corrodes when exposed to air, but unlike rusting steel, the corrosion of aluminum's surface layer forms a protective film that prevents degradation of the underlying metal. However, that film breaks down in some harsh environments, like seawater, leaving the metal vulnerable. Engineers have developed coatings to protect aluminum in these applications, but many of these use potentially toxic chemicals. Previous research suggested that extracts of date palm leaves had an anti-corrosion effect.

First test of the fruit’s juice

Gerengi decided to check date palm juice. He found that it inhibited corrosion of an aluminum alloy called AA7075, used in aerospace and other applications, in a salt solution. Gerengi noted that while an extract from date palm leaves is a known anticorrosive, this was the first test of the fruit's juice. The juice, which he reported adsorbed into the aluminum's surface, contains a number of sugars. Gerengi posited that these react with aluminum to form an anticorrosive film on the metal's surface.

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