Influence of laser remelting on the microstructure and corrosion behavior of HVOF-sprayed Fe-based coatings on magnesium alloy

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F22%3A00563149" target="_blank" >RIV/68081723:_____/22:00563149 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68081731:_____/22:00563149 RIV/00216305:26310/22:PU145802

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S1044580322006258" target="_blank" >https://www.sciencedirect.com/science/article/pii/S1044580322006258</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.matchar.2022.112343" target="_blank" >10.1016/j.matchar.2022.112343</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Influence of laser remelting on the microstructure and corrosion behavior of HVOF-sprayed Fe-based coatings on magnesium alloy

Popis výsledku v původním jazyce

An HVOF-sprayed Fe-based (Diamalloy 1010) coating deposited on AZ91 magnesium alloy was remelted using 650 W and 1000 W laser power. The microstructure of as-sprayed and laser remelted coatings and their phase composition were analyzed using SEM (Scanning Electron Microscopy) and XRD (X-Ray Diffraction) spectros-copy. The microstructure of the as-sprayed coating included crystalline and amorphous areas, which were shown by TEM (Transmission Electron Microscopy). According to XRD analysis the microstructure consisted of austenite and M7C3 carbides. After laser remelting, the structure of as-sprayed Diamalloy 1010 recrystallized and welldeveloped dendritic grains were formed. XRD analysis showed that laser remelting did not lead to the forma-tion of new phases. On the other hand, the grain recrystallization and microstructure arrangement in the laser remelted layer led to increased peak intensities of individual phases in the XRD pattern. This combined with a reduction in porosity from 0.7% to 0.0% resulted in an increase in microhardness from 554 +/- 8 HV0.1 up to 633 +/- 8 HV0.1 after remelting. Potentiodynamic polarization tests and EIS (Electrochemical Impedance Spectros-copy) showed that laser remelting under a power of 650 W can improve the corrosion behavior in 3.5% NaCl. The remelting of the coating using 650 W laser power resulted in an increase in corrosion potential from-425 +/- 13 mV to-210 +/- 21 mV and a decrease in corrosion current density from 23.57 +/- 4.59 mu A center dot cm- 2 to 0.44 +/- 0.05 mu A center dot cm- 2 when compared to the as-sprayed coating.

Název v anglickém jazyce

Influence of laser remelting on the microstructure and corrosion behavior of HVOF-sprayed Fe-based coatings on magnesium alloy

Popis výsledku anglicky

An HVOF-sprayed Fe-based (Diamalloy 1010) coating deposited on AZ91 magnesium alloy was remelted using 650 W and 1000 W laser power. The microstructure of as-sprayed and laser remelted coatings and their phase composition were analyzed using SEM (Scanning Electron Microscopy) and XRD (X-Ray Diffraction) spectros-copy. The microstructure of the as-sprayed coating included crystalline and amorphous areas, which were shown by TEM (Transmission Electron Microscopy). According to XRD analysis the microstructure consisted of austenite and M7C3 carbides. After laser remelting, the structure of as-sprayed Diamalloy 1010 recrystallized and welldeveloped dendritic grains were formed. XRD analysis showed that laser remelting did not lead to the forma-tion of new phases. On the other hand, the grain recrystallization and microstructure arrangement in the laser remelted layer led to increased peak intensities of individual phases in the XRD pattern. This combined with a reduction in porosity from 0.7% to 0.0% resulted in an increase in microhardness from 554 +/- 8 HV0.1 up to 633 +/- 8 HV0.1 after remelting. Potentiodynamic polarization tests and EIS (Electrochemical Impedance Spectros-copy) showed that laser remelting under a power of 650 W can improve the corrosion behavior in 3.5% NaCl. The remelting of the coating using 650 W laser power resulted in an increase in corrosion potential from-425 +/- 13 mV to-210 +/- 21 mV and a decrease in corrosion current density from 23.57 +/- 4.59 mu A center dot cm- 2 to 0.44 +/- 0.05 mu A center dot cm- 2 when compared to the as-sprayed coating.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20506 - Coating and films

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Materials Characterization

ISSN

1044-5803

e-ISSN

1873-4189

Svazek periodika

194

Číslo periodika v rámci svazku

December

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

13

Strana od-do

112343

Kód UT WoS článku

000868951900001

EID výsledku v databázi Scopus

2-s2.0-85139059439