Surface Analysis of Magnesium AZ31 Samples Immersed in Various Aqueous Solutions

Year 2023, Volume: 11 Issue: 5, 2321 - 2340, 29.12.2023

Erdem Sahin Meltem Alp Ahmed Şeref

https://doi.org/10.29130/dubited.1371973

Abstract

Rapid degradation in body fluids is known to be the main shortcoming of the AZ31 magnesium alloy that is aimed to be controlled in this study by chemical conversion of its surface in various phosphate and chloride solutions. Deposited layers on the surface of bare alloy plates were subjected to compositional and morphological analyses to assess their performance as barriers to degradation. Also changes in the mass of the samples and pH of the solutions were monitored during 21 day immersion periods. Formations of prismatic, platelike, needlelike crystals of various compositions including calcium phosphates, magnesium phosphates, magnesium chlorides were observed by scanning electron microscopy and their atomic compositions were determined by EDX and quantitative XRD analyses. The results indicate that a layer of ceramic of various thicknesses can stably form on the base alloy by simple adsorption of the particles suspended in the solution or by nucleation and growth of the products of reactions between dissolved ions and the metal ions released from the surface. These deposition layers that are solely induced by the electrochemical potential of the species in the solution offer facile surface modification methods and novel phases to control the degradation of magnesium alloys in aggressive environments such as body fluids or marine environments.

Keywords

AZ31 magnesium alloy, Coating, Magnesium phosphates, Calcium phosphates, Phase analysis.

Project Number

Tübitak 119N759

Thanks

The authors appreciate the financial support from Scientific and Technological Research Council of Turkiye (TUBITAK) (Project No: 2020-119N759). İzmir Institute of Technology Materials Research Center staff is acknowledged for their assistance in characterizations. Doebelin.org and Crystallography Open Database (Crystallography.net) are acknowledged for sharing their XRD analysis software and database.

Çeşitli Sulu Çözeltilerde Tutulan Magnezyum AZ31 Numunelerinin Yüzey Analizi

Abstract

Vücut ortamında hızlı bozunduğu bilinen AZ31 magnezyum alaşım yüzeyinin bu eksikliğinin çalışmamızda çeşitli fosfat ve klorür çözeltilerinde kimyasal dönüşüme maruz bırakılarak giderilmesi amaçlanmıştır. Alaşım plakaların yüzeyinde biriken katmanlar bozunmaya karşı bariyer performanslarını değerlendirmek için kimyasal ve morfolojik analizlere tabi tutulmuştur. Ayrıca numunelerin kütlesindeki ve çözeltilerin pH'ındaki değişiklikler 21 günlük daldırma süreleri boyunca izlenmiştir. Kalsiyum fosfatlar, magnezyum fosfatlar, magnezyum klorürler gibi çeşitli bileşimlerdeki prizmatik, plakamsı ve iğnemsi kristal oluşumları taramalı elektron mikroskobu ile incelenmiş ve bunların atomik bileşimleri EDX ve kantitatif XRD analizleri ile belirlenmiştir. Sonuçlar alaşım üzerinde çeşitli kalınlıklarda bir seramik tabakasının, basit adsorpsiyon ve çözünmüş iyonlar ile yüzeyden salınan metal iyonları arasındaki reaksiyon ürünlerinin çekirdeklenmesi ve büyümesi yoluyla kararlı bir şekilde oluşabildiğini göstermektedir. Yalnızca çözeltideki türlerin elektrokimyasal potansiyeli ile oluşan bu birikim katmanları, vücut sıvıları veya deniz ortamları gibi agresif ortamlarda magnezyum alaşımlarının bozunmasını kontrol etmek için sade bir yüzey modifikasyon yöntemi ve yeni fazlar sunmaktadır.

Keywords

AZ31 magnezyum alaşımı, Kaplama, Magnezyum fosfatlar, Kalsiyum fosfatlar, Faz analizi.

Supporting Institution

Çalışmamız M-era.net ISIDE projesi kapsamında Tübitak tarafından desteklenmiştir (Proje no:119N759)

Project Number

Tübitak 119N759

Thanks

Tübitak ARDEB'e maddi desteğinden dolayı teşekkür ederiz. Ayrıca İYTE MAM personeline karakterizasyon çalışmalarına katkılarından dolayı, Doebelin.org ve Crystallography.net'e açık kaynak XRD karakterizasyon araçlarını paylaştıkları için teşekkür ederiz.

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