19 - 23 September 2023,
Royal Hotel Carlton
Bologna, Italy
Paper Awards Bologna 2011
Best Paper Prizes
During the special atmosphere of the gala dinner on the evening of the third day of the congress at Palazzo Grassi, Dr. Dalla Barba awarded the prizes for the best four presentations. The winner were: Lorenzo Donati, University of Bologna, from Italy, Jack Tetrault, Duralectra/Sandford Process, from USA, Anne Deacon Juhl, Aluconsult, from Denmark, and Judy Mary Runge, Compcote International, from USA.
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Dr. Anne Deacon Juhl during her presentation
THE COST SAVINGS WHEN USING SQUARE WAVE PULSE ANODISING. Anne Deacon Juhl, AluConsult, Denmark Abstract This presentation will show that the ROI is less than a year for an Anodising line to switch from conventional DC anodising to slow square, pulse Anodising. All because of the increase in productivity and decrease in energy consumption by using slow square pulse anodising. This will include a description of an invented anodising job shop to show the figures. To know what conventional anodising is and what kind of pulse anodising we are talking about, there will be a short introduction to the two process plus results from a Danish project about introducing pulse anodising in an existing anodising line presented in 2007 at the Aluminium Two Thousand 6th world congress in Florence. |
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Ing. Lorenzo Donati receiving the award from Dr. Dalla Barba
EXTRUSION BENCHMARK 2007 AND 2009: A MEASUREMENT OF THE INCREASE OF FEM CODE ACCURACY FOR EXTRUSION PROCESS ANALYSIS L. Donati1, N. Ben Khalifa2, L. Tomesani 1, A.E. Tekkaya 2 1 University of Bologna, DIEM Department, Italy, 2 Institute of Forming Technology and Lightweight Construction (IUL), Technische Universität Dortmund, 44227 Dortmund, Germany Abstract In the paper the results of the benchmark between experimental trials and FEM outputs of the two previous editions (2007 held in Bologna and 2009 held in Dortmund) are presented and discussed. The dies design is initially introduced and explained in detail in order to clarify which phenomena would be analyzed with the selected design. Experimental trials are then presented with a particular focus on the monitored data; information on trial repetition are also provided. Then a summary of the different FEM codes approaches, of the computational times, of the main outputs and their comparison with experimental results are presented for both conference editions. Profile lengths, die and profile temperatures, process load and die deflections were used as benchmarking parameters for FEM comparison. A detailed discussion for all output parameters is realized in order to understand the potentials and limits of each code. Finally a discussion on future perspective for FE code application and on the next benchmark edition is reported. |
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Dr. Runge presents the paper about the anodizing die cast substrates
CONNECTING THEORY TO PRACTICE: THE SCIENCE OF SUCCESSFULLY ANODIZING DIE CAST SUBSTRATES Jude Mary Runge, Comprehensive Metallurgical Consulting, Lombard, Illinois, USA Larry Chesterfield, Anodizing Technologies, Inc., Indianapolis, Indiana, USA Abstract Die castings pose some of the most challenging problems in anodizing. The finish can be too thin, non-uniform and/or have an unfavorable appearance. These are common problems with a variety of practical solutions; they are easy to recognize, but in many instances, the source for the problem remains unknown. Critical to solving the problems of anodizing die castings is understanding the die cast substrate and the impact of surface condition, alloy composition, casting quality and microstructure on the anodizing process. Substrate quality issues are just as important, maybe more so, than anodizing conditions and technique. Certain optimum anodizing conditions may be used in some cases to help overcome less than advantageous metallurgical conditions. These include well known processing tools such as various pretreatment chemistries, higher anodizing electrolyte acid concentration, and higher bath temperatures. These, and other recommended solutions are not successful in every case; sometimes trial and error testing on actual production parts must be done to find the best processing techniques. By providing real-life solutions in terms of anodizing theory and interfacial science, this paper gives insight to anodizing solutions for die cast alloys by tying together metallurgical science with anodizing practice. |
MICRO-CRYSTALLINE ANODIC COATINGS
(A REVOLUTIONARY PLATFORM TECHNOLOGY FOR CORROSION PROTECTION)
Jack Tetrault D-CHN/Sanford Process Corporation Inc., USA
Tim Cabot Katahdin Inc.
Dr. Mike Sung D-CHN LLC
Abstract
A basic requirement for finishing aluminum is to protect the volatile untreated surface from corrosion attack. However, current solutions provide insufficient protection and therefore limit the areas where aluminum can be used or require more expensive solutions such as polymeric overcoats.
The advent of a new technology that retained many of the design, process economics, and engineering characteristics of anodic coatings while fundamentally changing corrosion resistance would solve many existing problems and open broad new uses for aluminum.
In 2010, the parent company of The Sanford Process Corporation, Duralectra-CHN issued a set of patents on Micro-Crystalline Anodic Coatings where conventional amorphous oxide created by Type II/Type III anodizing was converted into closely knit micro-crystalline structures. Phase changing a portion of the oxide in this way creates an effective barrier to corrosion attack by dramatically lowering the rate of chemically induced solubility of the oxide (for instance in the presence of high/low pH chemistry, galvanic conditions, etc.) while lowering overall surface to substrate activity. Further, the novel coating protects entrapped dye colorants in the pores from superheated steam allowing articles to be sterilized and/or cleaned in dishwashers without fading and discoloration.
The paper provided for this conference will examine this new oxide, how it is constituted, and the performance results in various application studies vs. conventional anodic coatings.
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"I wish to congratulate for such a successful congress, where I had the opportunity to meet new friends..."
- Alfredo Flores Valdes, Cinvestav-IPN, Mexico -
"The organization of the congress was excellent. Very prompt and useful corresponcende. The papers presented were very informative and highly scientific.... "
- Elena David, National Institute for Cryogenic and Isotopic Tehcnologies, Romania -
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