Raman imaging of ancient rust scales on archaeological iron artefacts for long-term atmospheric corrosion mechanisms study

2006 ◽  
Vol 37 (10) ◽  
pp. 1228-1237 ◽  
Author(s):  
Delphine Neff ◽  
Ludovic Bellot-Gurlet ◽  
Philippe Dillmann ◽  
Solenn Reguer ◽  
Ludovic Legrand
Keyword(s):  
Atmospheric Corrosion ◽  
Raman Imaging ◽  
Archaeological Iron ◽  
Corrosion Mechanisms

Long term atmospheric corrosion in Mauritius

2014 ◽  
Vol 50 (2) ◽  
pp. 155-159 ◽  
Author(s):  
B. Y. R. Surnam ◽  
C. W. Chiu ◽  
H. P. Xiao ◽  
H. Liang
Keyword(s):  
Atmospheric Corrosion

The Influence of Contaminants on the Failure of Protective Organic Coatings on Steel

CORROSION ◽  
1977 ◽  
Vol 33 (6) ◽  
pp. 209-217 ◽  
Author(s):  
E. L KOEHLER
Keyword(s):  
Atmospheric Corrosion ◽  
Specific Effect ◽  
Organic Coating ◽  
Organic Coatings ◽  
Basic Solution ◽  
Water Displacement ◽  
Coating Adhesion ◽  
Conductive Film ◽  
Filiform Corrosion ◽  
Corrosion Mechanisms

Abstract While the ability of the organic coating to conduct corrosion currents may sometimes come into play, primarily the corrosive deterioration of protective organic coatings is brought above by the flow of corrosion currents through a film of electrolyte beneath the organic coating. Any of several specific mechanisms may be involved. The influences of contaminants lie in their abilities to: (1) draw water through the organic coating to establish a conductive film of moisture, (2) provide ions to carry the corrosion currents, and (3) provide ions of specific effect on underfilm corrosion mechanisms. Specific attention is given here to the effects of underfilm salt contaminants on atmospheric corrosion. Filiform corrosion observed is interpreted as a form of anodic undermining corrosion, which involves transport of the anion and the effect of the anion on the dissolution of metal from beneath the organic coating. Cathodic detachment, also observed, is interpreted in terms of cationic transport and the ability of the specific cation to form a strongly basic solution, resulting in loss of organic coating adhesion by water displacement.

Physicochemical approaches to gold and silver work, an overview: Searching for technologies, tracing routes, attempting to preserve

2018 ◽  
Vol 4 (2) ◽  
Author(s):  
Maria F. Guerra
Keyword(s):  
Atmospheric Corrosion ◽  
Raw Materials ◽  
Precious Metals ◽  
Gold Alloys ◽  
Exchange Networks ◽  
Trade Routes ◽  
Physicochemical Methods ◽  
Corrosion Mechanisms ◽  
Challenging Question

Abstract Gold alloys and silver alloys have always been widely employed in the production of significant objects. With high reflectivity, precious metals are perceived as both materials and colours, and can be skilfully combined to produce metallic polychrome effects. Because their structure and composition contain information on their manufacture, use, disclaim and degradation, items in gold and in silver enclose major information on the technologies employed by past societies and on exchange networks. This information can be acquired using appropriate analytical protocols, established according to the nature of the query and the characteristics of the objects. By using physicochemical techniques, it is possible to identify the technologies, materials and tools used by the artisan and, in particular cases, to situate the sources of raw materials and the workshops producing the objects, as well as to follow the trade routes. The aim of this work is to outline major achievements in the study of goldwork and silverwork based on the different physicochemical methods that are available, and to refer the analytical difficulties that have to be faced when studying objects made from precious metals. Based on several examples, three topics are addressed. The first concerns the major role of the techniques of exam when describing shaping, decorating, assembling and finishing; the second considers the search for metallic polychrome effects in some cultural areas; and the third discusses the challenging question of fingerprinting. A fourth section is dedicated to a short reflection on the difficulties related to the identification of the atmospheric corrosion mechanisms of precious metals.

scholarly journals The role of Sn on the long-term atmospheric corrosion of binary Cu-Sn bronze alloys in architecture

2019 ◽  
Vol 149 ◽  
pp. 54-67 ◽  
Author(s):  
T. Chang ◽  
G. Herting ◽  
S. Goidanich ◽  
J.M. Sánchez Amaya ◽  
M.A. Arenas ◽  
...  
Keyword(s):  
Atmospheric Corrosion

Localisation of oxygen reduction sites in the case of iron long term atmospheric corrosion

2011 ◽  
Vol 53 (8) ◽  
pp. 2468-2473 ◽  
Author(s):  
Judith Monnier ◽  
Emilien Burger ◽  
Pascal Berger ◽  
Delphine Neff ◽  
Ivan Guillot ◽  
...  
Keyword(s):  
Oxygen Reduction ◽  
Atmospheric Corrosion

Long-term prediction on atmospheric corrosion data series of carbon steel in China based on NGBM(1,1) model and genetic algorithm

2019 ◽  
Vol 66 (4) ◽  
pp. 403-411 ◽  
Author(s):  
Yuanjie Zhi ◽  
Dongmei Fu ◽  
Tao Yang ◽  
Dawei Zhang ◽  
Xiaogang Li ◽  
...  
Keyword(s):  
Genetic Algorithm ◽  
Carbon Steel ◽  
Atmospheric Corrosion ◽  
Data Series ◽  
Data Sets ◽  
Content Type ◽  
Term Prediction ◽  
Long Term Prediction ◽  
Corrosion Data

PurposeThis study aims to achieve long-term prediction on a specific monotonic data series of atmospheric corrosion rate vs time.Design/methodology/approachThis paper presents a new method, used to the collected corrosion data of carbon steel provided by the China Gateway to Corrosion and Protection, that combines non-linear gray Bernoulli model (NGBM(1,1) with genetic algorithm to attain the purpose of this study.FindingsResults of the experiments showed that the present study’s method is more accurate than other algorithms. In particular, the mean absolute percentage error (MAPE) and the root mean square error (RMSE) of the proposed method in data sets are 9.15 per cent and 1.23 µm/a, respectively. Furthermore, this study illustrates that model parameter can be used to evaluate the similarity of curve tendency between two carbon steel data sets.Originality/valueCorrosion data are part of a typical small-sample data set, and these also belong to a gray system because corrosion has a clear outcome and an uncertainly occurrence mechanism. In this work, a new gray forecast model was proposed to achieve the goal of long-term prediction of carbon steel in China.

scholarly journals Long-Term Atmospheric Corrosion Behavior of Epoxy Prime Coated Aluminum Alloy 7075-T6 in Coastal Environment

Materials ◽  
2018 ◽  
Vol 11 (6) ◽  
pp. 965 ◽  
Author(s):  
Sheng Zhang ◽  
Yuting He ◽  
Teng Zhang ◽  
Guirong Wang ◽  
Xu Du
Keyword(s):  
Aluminum Alloy ◽  
Corrosion Behavior ◽  
Atmospheric Corrosion ◽  
Coastal Environment ◽  
Aluminum Alloy 7075

Atmospheric Corrosion in Marine Environments

CORROSION ◽  
1978 ◽  
Vol 34 (12) ◽  
pp. 433-437 ◽  
Author(s):  
R. A. LEGAULT ◽  
V. P. PEARSON
Keyword(s):  
Corrosion Behavior ◽  
Atmospheric Corrosion ◽  
Low Alloy Steels ◽  
Marine Environments ◽  
Weight Losses ◽  
Alloy Steels

Abstract It has been demonstrated that the natural atmospheric corrosion behavior of low alloy steels in marine environments can be accurately described by an equation of the form: ΔW = KtN. With this relationship, reliable predictions of long term weight losses can be made from as few as two sets of determinations obtained in relatively short exposures. The reliability of this relationship has also been established for galvanized and aluminized steels.

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