Powder the Architectural Powder Coating System Environmental Issues Atmospheric Pollution Non-chromium Pretreatment
coating is a rapidly growing segment of the surface finishing industry. Its advantages include relative ease of application , quick clean-up and less environmental regulatory pressure. The following article is an edited version of the text of just one of the many outstanding technicalpresentations made at Powder Coating '94, October 17-13, in Cincin-nati, reprintedhere with permission. Copyright 7994, The Powder Coating Institute. All rights reserved. The use of powder coatings for the protection and decoration of architectural aluminum is continuing to grow in popularity worldwide. The recent Introduction of new technologies is accelerating this growth in North American, Far Eastern and Aus-tralasian markets. Thisarticlewill review current world market position. Particular reference will be made to new powder developments , including high-durability systems , and the latest results from field experience will be presented, including information on corrosion prevention. Technical and economic benefits to end users will also be compared with competing technologies. rchitectural powder coatings have now been used around the world A for more than 20 years. By providing excellent functional and cosmetic protection, powders have become increasingly popular. Architects appreci-atethechoice itgivesthem indesign, and powder users like the relatively simple application process. Until recently, the technology of ther-mosetting polyester powders had, in fact, changed relatively little. The last few years, however, have witnessed exciting advances in all the principle elements of the architectural powder coating system. There have been developments in pre-super weatherability), new design and fabrication techniques (e.g., thermal breaks and structural glazing) and novel powder application methods for aluminum extrusions (e.g., vertical lines). To ensure the successful protection of architectural metal, it is important to consider the entire system. The aluminum, pretreatment, or finish cannot be considered in isolation. And, even though powder manufacturers can only directly con-trolthe paint formulation, they must work closely with other suppliers and also direct their research programs to take all factors into account. The correct combination of these elements can then provide the appropriate corrosion resistance, exterior weather-abilityand the most economic method of finishing architectural aluminum extru-sions and panels. In the architectural sector, specific challenges are continuing to drive progress toward increased environmental acceptability of architectural systems. Aluminum , because of its recyclability, is preferable to PVC, and correctly designed, thermally insulated glazing systems save energy. In thisarticle,thestudyofenvironmen-tal impact is split into two categories: The impact of the paint finish, itself, and influences from other stages of the finishing processes. Powder …
Filiform Corrosion on Architectural Aluminium: A Review
Filiform corrosion was first detected on architectural aluminium in the early 1980s. Over the past decade the number of incidences has been small in relation to the number of projects which have been successfully enhanced and protected by organic coating systems. During this period use of painted aluminium has grown significantly to replace anodizing as the major finishing method in Europe. Reports of filiform have been largely limited to areas in Holland, Belgium and Germany, where a marine climate co‐exists with an industrial atmosphere.
Establishing Self-Access: From Theory to Practice
Chapter 1: Background to Self-Access Language Learning Chapter 2 : Learners' and Teachers' Beliefs and Attitudes about Language Learning Chapter 3: A Typology Of Self-Access Chapter 4: Management Of Self-Access Facilities Chapter 5: Learner Profiles Chapter 6: Materials For Self Access Language Chapter 7: Self-Access Activities Chapter 8: Physical Settings And Resourcing Chapter 9: From Teacher-Directed to Self-Access Learning Chapter 10: Counselling Chapter 11: Assessment In Self-Access Learning Chapter 12: The Evaluation Of Self-Access Language Learning Case Studies