Degradation characteristics of Mg0.8Ca in saline solution with and without albumin protein investigated by electrochemical impedance spectroscopy

Abstract

Biodegradable magnesium-calcium (MgCa) alloy is a very attractive biomaterial. Binary Mg0.8Ca alloy was fabricated. X-ray diffraction (XRD) analysis and optical microscopy observed showed that Mg0.8Ca alloy was composed of a(Mg) phase. The electrochemical impedance spectroscopy (EIS) technique was used for the study on the degradation characteristics of Mg0.8Ca alloy. Because the proteins have a role on the passivation of metals, the effect of albumin protein addition in NaCl solution on the electrochemical behaviour of Mg0.8Ca alloy was studied. It has been shown that in 0.9 wt% NaCl solution the impedance was mainly characterised by one capacitive and one inductive effect, which related to the alloy charge transfer reaction and the relaxation of the absorbed corrosion compounds. The addition of 37.5 mg/mL albumin protein to 0.9 wt% NaCl solution increased the impedance compared to that without albumin protein. The equivalent circuits simulating the electrochemical behaviour of Mg0.8Ca alloy in 0.9 wt% NaCl solution with and without albumin protein were proposed. The surface morphology of the Mg0.8Ca samples after 1-week immersion in Mg0.8Ca alloy in 0.9 wt% NaCl solution with albumin protein was studied using scanning electron microscopy (SEM). The electrochemical mechanism for degradation of Mg0.8Ca alloy in 0.9 wt% NaCl solution is related to the albumin protein addition.

Comparative Study of the Structure, Properties, and Corrosion Behavior of Sr-Containing Biocoatings on Mg0.8Ca

“…Deposition of the corrosion products took place at the phase boundary of the alloy/electrolyte interface for untreated samples and the alloy/coating/electrolyte interface for the coated samples. The dissolution is preceded by adsorption of chlorides on the hydroxide layer [69]: The inductance L values for all samples (Table 3) were far from the values, which are common in electrical engineering, which is associated with the formal use of this element, which is responsible in the EIS for slow adsorption and gas evolution. Sr-HA 500 V 3.5 × 10 −6 0.86 5.4 × 10 4 1.5 × 10 −5 0.86 4.6 × 10 4 1.4 × 10 5 1.4 × 10 3…”

Surface Modification of Mg0.8Ca Alloy via Wollastonite Micro-Arc Coatings: Significant Improvement in Corrosion Resistance

“…Mg alloys as orthopedic biomaterials have huge advantages-such as a low weight and density, as well as an elastic modulus similar to that of human bone-which exclude the probability of shielding bone stress [9,[15][16][17]. Magnesium is one of the main elements of human organisms.…”

“…Magnesium is one of the main elements of human organisms. This element is actively involved in processes that are closely related to cell differentiation and the mineralization of calcified tissue, and indirectly affect mineral metabolism [16,17]. The disadvantage of magnesium is its weak strength properties.…”

“…However, such mechanical characteristics as strength, fracture toughness, creep resistance, hardness, and biocompatible properties can be improved by alloying magnesium with different elements (Al, Zn, Ca, Mn, Sn, Ce, etc.) [15,16,18]. Mg-Ca alloys as bioresorbable/biodegradable materials provide excellent biocompatibility and sufficient strength.…”

In vitro corrosion behavior of Mg‐5Zn alloy containing low Y contents

“…Over the past decade, magnesium (Mg) and its alloys are widely investigated for manufacturing biodegradable implants more than biodegradable polymers and conventional biomaterials . This is due to the high tensile yield strength, low density, modulus of elasticity close to natural bone of magnesium implants which prevent the stress‐shield phenomena . In addition, magnesium is an essential element for the body, in which it participates in metabolic reactions and contributes in the growth of bone tissue.…”