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Recent Advance in Corrosion Resistance and Corrosion Protection technology
2019/05/30
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The development in ecology, medicine, life science, and economics have led to changing the stereotype of common sense in consideration of the material circulation on a global scale and the influence on organisms and a new concept of society is thus proposed, that is, structuring of a society with a less burden to the succeeding generation. Concretely, this comprises “Effective utilization of limited resources to a higher degree,” “Reduction in environmental burden,” “Enhancement of reliability,” and “Reduction in burden for the maintenance of the infrastructure.” In other words, in the corrosion resistance technology, the request of conformity with social needs is becoming all the more urgent in addition to a comparatively simple request for the control of rust and thinning. In addition to developing the basic techniques applicable to various surroundings,further investigation and research have been launched, and are still going on over various fields.
shows the examples of steel corrosion problems in respective fields as well as the outlines of the corrosion-resistant steel materials and coated steel sheets, recently developed by Nippon Steel.
Nippon Steel has developed the following steel materials:
1) In terms of effective utilization of resources, Dymazinc and Super Dyma, both of which can offer long-term anticorrosive performance and corrosion-resistant properties with a less coating
2) In terms of the reduction in environmental load materials, Alcoated steel sheet for fuel tanks, Sn-Zn coated steel sheets (EcokoteT and Eco Trio), lead-free coated steel sheets, such as SilverzincNT, and chromate-free coated steel sheets, such as Zincoat 21 and Silverzinc 21
3) In terms of the enhancement of reliability, highly corrosion resistant steel materials, such as titanium-clad steel and YUS270 Super-stainless steel In terms of the reduction in burden for the maintenance of social infrastructures, Nippon Steel has developed various techniques that can contribute to the future application of steel as described below:
1) A technique of predicting the life expectancy of not only costal weathering steel enabling a long-term durability in the coastal area but also weathering steel and Dymazinc-thermal-sprayed steel for petroleum tanks on the basis of massive evaluation data and their multivariable volume analytical technique
2) A technique of real time monitoring of a corrosion condition by using advanced electrochemical technology
3) A new evaluation technique in compliance with the real condition2)
4) A proposal for standardization of those evaluation techniques for JIS and ISO is also under way.
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