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

Result code in 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>

Alternative codes found

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

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20506 - Coating and films

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2022

Confidentiality

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

Name of the periodical

Materials Characterization

ISSN

1044-5803

e-ISSN

1873-4189

Volume of the periodical

194

Issue of the periodical within the volume

December

Country of publishing house

US - UNITED STATES

Number of pages

13

Pages from-to

112343

UT code for WoS article

000868951900001

EID of the result in the Scopus database

2-s2.0-85139059439