Thesis (PH. D.)--Columbia University, 1926. / Vita. eContent provider-neutral record in process. Description based on print version record.

Thesis (Ph. D.)--Institute of Paper Chemistry, 1943. / Includes bibliographical references (p. 84-85).

No description available.

Chromium passivation treatment on tinplate is important in stabilising the active tin surface in terms of oxidation resistance, sulphide stain resistance and ensuring good lacquer adhesion properties. Through this research, the reason was explored why dip passivation treatment, in sodium dichromate, provides superior lacquer adhesion properties on tinplate compared to electrolytic sodium dichromate (CDC) treatments. A critical assessment of the current knowledge of chromium passivation treatments on tinplate formed the basis of the experimental work. Through electrochemical and surface analytical techniques (X-Ray Photoelectron Spectroscopy and Auger Electron Spectroscopy) both dip and CDC treated tinplate surfaces were characterised in terms of surface species. It was shown through XPS, using angle resolved techniques, that no metallic chromium forms on the tinplate surface during CDC treatments. Furthermore, a difference in chromium surface species was established for the dip and CDC processes showing additional SnO and Cr(OH)3.nH2O species for the latter. Complementary to these findings, it was verified that the formation of additional chromium hydroxide species is a function of pH, governed by the applied cathodic current during the CDC process itself. The inferior adhesion properties of CDC treated tinplate were shown to be related to the difference in the respective surface species formed during dip and CDC applications. Copyright 2004, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. Please cite as follows: Biermann, MC 2004, A critical assessment of the current understanding of chromium passivation treatments in tinplate, MSc dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://upetd.up.ac.za/thesis/available/etd-04172007-123305 / > / Dissertation (MSc(Applied Sciences))--University of Pretoria, 2007. / Materials Science and Metallurgical Engineering / unrestricted

Companies today strive to lower their climate footprint in their daily work. It is therefore important for them to consider sustainable development when investing in new production equipment. The purpose of the study is to create a greater understanding to which parameters should be involved in a TCO with focus on sustainable development.  A support process at the case company was studied with the purpose of develop an understanding of its current situation. The current situation was then analysed to determine the parameters that should be used in the TCO. The analysis was also used to develop any suggestion of improvement on production equipment.  The result of the study presents a template for a TCO with focus on sustainable development together with a model for investment calculation which can be applied on future investments. It is determined that no suggestions of improvement will be presented as the subject hasn’t been researched enough.  The conclusion is that further studies on the subject must be carried out to be able to present any suggestions on improved production equipment.

第23回名古屋大学年代測定総合研究センターシンポジウム平成22(2010)年度報告