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Ocena archeometalurgicznych stopów miedzi po wytworzeniu i po badaniach grawimetrycznych w roztworze imitującym kwaśną glebę

Brojanowska Agnieszka, Budniak Karolina, Miśta-Jakubowska Ewelina A., Moszczyńska Dorota

Ochrona przed Korozją

2021

nr 4

106--117

Niniejsza praca mieści się na styku inżynierii materiałowej, korozjii archeologii eksperymentalnej. Do badań wybrano 1 mosiądz i 3 brązy. Próbki uzyskano poprzez wytop tyglowy mieszaniny składników stopowych i scharakteryzowano (morfologia powierzchni – SEM i skład chemiczny – EDS). Próbki umieszczono w roztworach wodnych symulujących natlenioną glebę o pH równym 3,6 i zawierającą jony Cl- i SO42- na okres prawie 1600 dni. Po wyjęciu próbek wykonano badania morfologii powierzchni (SEM), składu chemicznego (EDS) i fazowego (XRD) produktów korozji. Wykonano obliczenia szybkości korozji metodą grawimetryczną oraz zbadano pH roztworów po ekspozycji. Wykazano obecność odcynowania, jako mechanizmu korozji brązów archeometalurgicznych przy jednoczesnym braku stałych produktów korozji tego pierwiastka, co może doprowadzić do błędnej klasyfikacji rzeczywistych znalezisk archeologicznych. Wskazano również perspektywiczny charakter badań pH gleby w aspekcie oceny szybkości korozji artefaktów archeologicznych.

The present work straddles the fields of materials engineering, corrosion and experimental archaeology. One brass and three bronze samples were selected for the study. The samples were obtained by crucible melting of a mixture of alloying elements and characterised (surface morphology - SEM and chemical composition - EDS). The samples were placed in aqueous solutions simulating oxygenated soil with a pH of 3.6 and containing Cl- and SO42- ions for almost 1600 days. After removing the samples, surface morphology (SEM), chemical composition (EDS) and phase composition (XRD) of the corrosion products were studied. Corrosion rate calculations were performed using the weight loss method and the pH of the solutions after exposure was investigated. Detinning as a corrosion mechanism for archaeometallurgical bronzes was demonstrated, while the absence of solid corrosion products of this element can lead to misclassification of actual archaeological finds. The prospective nature of soil pH studies in terms of assessing the corrosion rate of archaeological artefacts is also indicated.

Corrosion behavior of ZrC particles reinforcement with Al-12Si composites by weight loss method using acidic media

John C. F., Paul R. C., Singh S. C. E., Jacobjose J., Ramkumar T., Hikku G. S., Sharma R. K., Sengottuvel P.

Bulletin of the Polish Academy of Sciences. Technical Sciences

2018

Vol. 66, nr 1

9--16

This paper aims to investigate the corrosion behavior of zirconium carbide (ZrC) reinforced Al – Si metal matrix composites (MMCs) in a mixture of acidic solution using weight loss method. The composites are prepared by powder metallurgy method. Al-12Si-xZrC composites containing 0, 5, and 10 weight percentage of ZrC particles are compacted in a die set assembly and sintered in an inert gas muffle furnace. The acidic solutions used for corrosion are 1 N HCl, 1 N H2SO4 and 1 N HNO3. The corrosion characteristics of Al-12Si-xZrC composites and the pure Al were experimentally evaluated. The corrosion test was carried out at different weight proportions of the samples in various concentrations of the acid such as 1 N HCl, 1 N H2SO4 and 1 N HNO3 for different exposure time (i.e., 24 h, 72 h, 144 h and 216 h), respectively. The results specified that corrosion rate of composites was lower than that of base metal Al under the corrosive atmosphere, regardless of exposure time and acidic solutions used as corrodents. Al-12Si-xZrC composites become more corrosion resistant as the ZrC content is increased. This is because of the development of stable oxide layer above the specimens. Scanning electron microscopy (SEM) confirms the degree of attack of acidic solution on the surface of the examined material.

Effect of deformation-induced martensite on the microstructure, mechanical properties and corrosion resistance of X5CrNi18-8 stainless steel

Ozgowicz W., Kurc A., Kciuk M.

Archives of Materials Science and Engineering

2010

Vol. 43, nr 1

42-53

Purpose: The aim of the paper was to determine the effect of deformation-induced martensite on the microstructure, mechanical properties and corrosion resistance of X5CrNi18-8 austenitic steel. Design/methodology/approach: The investigations included observations of the microstructure on a light microscope, researches of mechanical properties in a static tensile test, microhardness measurements made by Vickers's method and corrosion resistance test examined using weight method. The analysis of the phase composition was carried out on the basis of X-ray researches. The amount of martensite α' in the obtained microstructures was investigated with ferritescope magnetic tester. The observations of the surface morphology after corrosive tests were carried out using Scanning Electron Microscope. The scope of this study was to achieve the correlations between the mechanical, corrosion and structural properties of cold rolled stainless steel. Findings: Plastic deformation in a cold working of austenitic stainless steel induced in its structure martensitic transformation γ → α'. The occurrence of martensite α' in the investigated steel structure has an essential meaning in manufacturing process of forming sheet-metals from austenitic steel. Research limitations/implications: The X-ray phase analysis in particular permitted to disclose and identify the main phases on the structure of the investigated steel after its deformation within the range 10 - 70%. The results of the ferritescope measurements allowed determining the proportional part of α' phases in the structure of investigated steel in the examined range of cold plastic deformation. The microscope observations of the surface samples subjected to corrosion resistance test in 30 wt% H2SO4 solutions permitted to evaluate kinds and the rate of corrosion damages. Originality/value: A wide range of practical applications of 18/8 steel sheets is warranted by both their high corrosion resistance and high plastic properties.