Comparison of Atmospheric Corrosion of Additively Manufactured and Cast Al-10Si-Mg Over a Range of Heat Treatments

CORROSION ◽  
10.5006/3318 ◽  
2019 ◽  
Vol 75 (12) ◽  
pp. 1527-1540 ◽  
Author(s):  
Gregory W. Kubacki ◽  
John P. Brownhill ◽  
Robert G. Kelly
Keyword(s):  
Atmospheric Corrosion ◽  
Treatment Protocol ◽  
Corrosion Damage ◽  
Heat Treatments ◽  
Mg Alloy ◽  
Sample Type ◽  
Corrosion Properties ◽  
Melt Pool ◽  
Corrosion Susceptibility ◽  
Traditional Manufacturing

Additive manufacturing (AM) of metals has gained attention as a technology to rapidly produce complex components while reducing waste generated by traditional manufacturing methods. The corrosion properties of AM alloys are not well understood and merit further exploration. The goal of this study is to compare the atmospheric corrosion susceptibility of printed Al-10Si-Mg alloy to its cast counterpart over a range of heat treatments, including as-produced, T5, and T6 tempers. Atmospheric corrosion testing was performed in a salt-fog chamber using a modified G85-A2 cycle for 31 d. Additionally, potentiodynamic testing was used to assess the kinetics of each sample type in dilute Harrison’s solution. Comparison of corrosion damage revealed that cast and AM samples of similar temper had similar damage frequency and average damage depth, but AM samples had greater maximum depths. In as-built and T5 tempers, the AM samples showed preferential attack of the melt pool boundaries. The corrosion was dominated by a dissolution of Al that appeared to favor a path of least resistance through coarser or more discontinuous regions of the Si network at the melt pool boundary. The heat treatment protocol for the T6 temper removed the melt pool structure and resulted in a more general, and more severe, attack because the Si network was no longer present to impede dissolution. Heat treatments after printing were found to be deleterious to the atmospheric corrosion resistance of AM Al-10Si-Mg alloy.

Relationship between Heat Treatments and Corrosion of Al-Si-Mg Casting Alloy

2014 ◽  
Vol 900 ◽  
pp. 96-99 ◽  
Author(s):  
Ping Chen ◽  
Li Hua Liang ◽  
Gong Luo ◽  
Jian Min Zeng
Keyword(s):  
Solution Treatment ◽  
Heat Treatments ◽  
Mg Alloy ◽  
Casting Alloy ◽  
Nacl Solution ◽  
Corrosion Properties ◽  
Immersion Corrosion ◽  
Peak Aging ◽  
Mechanical Properties And Corrosion ◽  
Scanning Electron

The casting Al-Si-Mg alloy can be strengthened by heat treatments. There are close relations between heat treatments and alloys mechanical properties and corrosion resistance. The effects of heat treatments condition on corrosion behavior of Al-Si-Mg alloy in NaCl solution were studied by electrochemistry tests and immersion corrosion tests in this paper. The morphology of alloys after immersion corrosion was observed by OM (optical microscopy) and SEM (scanning electron microscopy). The influences of heat treatments on the corrosion of casting Al-Si-Mg alloy were explained. Different microstructures could lead to variation of corrosion properties. The corrosion properties of Al-Si-Mg alloy after casting, ST (solution treatment) and different aging respectively were analyzed. The results show that corrosion properties under PA (peak aging) are the worst and the best ones with ST, at the same time the Icorr under PA are the highest case and the lowest ones with ST.

scholarly journals Bioactivity Performance of Pure Mg after Plasma Electrolytic Oxidation in Silicate-Based Solutions

Molecules ◽  
2021 ◽  
Vol 26 (7) ◽  
pp. 2094
Author(s):  
Yevheniia Husak ◽  
Joanna Michalska ◽  
Oleksandr Oleshko ◽  
Viktoriia Korniienko ◽  
Karlis Grundsteins ◽  
...  
Keyword(s):  
Cell Culture ◽  
Oxide Layer ◽  
Plasma Electrolytic Oxidation ◽  
Oxide Coating ◽  
Mg Alloy ◽  
Aureus Strain ◽  
Active Surface Area ◽  
Corrosion Properties ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

The biodegradable metals, including magnesium (Mg), are a convenient alternative to permanent metals but fast uncontrolled corrosion limited wide clinical application. Formation of a barrier coating on Mg alloys could be a successful strategy for the production of a stable external layer that prevents fast corrosion. Our research was aimed to develop an Mg stable oxide coating using plasma electrolytic oxidation (PEO) in silicate-based solutions. 99.9% pure Mg alloy was anodized in electrolytes contained mixtures of sodium silicate and sodium fluoride, calcium hydroxide and sodium hydroxide. Scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), contact angle (CA), Photoluminescence analysis and immersion tests were performed to assess structural and long-term corrosion properties of the new coating. Biocompatibility and antibacterial potential of the new coating were evaluated using U2OS cell culture and the gram-positive Staphylococcus aureus (S. aureus, strain B 918). PEO provided the formation of a porous oxide layer with relatively high roughness. It was shown that Ca(OH)2 was a crucial compound for oxidation and surface modification of Mg implants, treated with the PEO method. The addition of Ca2+ ions resulted in more intense oxidation of the Mg surface and growth of the oxide layer with a higher active surface area. Cell culture experiments demonstrated appropriate cell adhesion to all investigated coatings with a significantly better proliferation rate for the samples treated in Ca(OH)2-containing electrolyte. In contrast, NaOH-based electrolyte provided more relevant antibacterial effects but did not support cell proliferation. In conclusion, it should be noted that PEO of Mg alloy in silicate baths containing Ca(OH)2 provided the formation of stable biocompatible oxide coatings that could be used in the development of commercial degradable implants.

Marine Atmospheric Corrosion of Additively Manufactured Stainless Steels

CORROSION ◽  
10.5006/3793 ◽  
2021 ◽  
Author(s):  
Michael Melia ◽  
Jesse Duran ◽  
Jason Taylor ◽  
Francisco Presuel-Moreno ◽  
Rebecca Schaller ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Pitting Corrosion ◽  
Stainless Steels ◽  
Atmospheric Corrosion ◽  
Laboratory Experiments ◽  
Dislocation Cell ◽  
Eastern Coast ◽  
Melt Pool ◽  
Cell Structures ◽  
Cellular Microstructure

Additively manufactured (AM) stainless steels exhibit numerous microstructural differences compared to their wrought counterparts, such as Cr enriched dislocation cell structures. The influence these unique features have on a SSs corrosion resistance are still under investigation with most current works limited to laboratory experiments. The work herein shows the first documented study of AM 304L and 316L exposed to a severe marine environment on the eastern coast of Florida with comparisons made to wrought counterparts. Coupons were exposed for 21 months and resulted in significant pitting corrosion to initiate after 1 month of exposure for all conditions. At all times, the AM coupons exhibited lower average and maximum pit depths than their wrought counterparts. After 21 months, pits on average were 4 μm deep for AM 316L specimen and 8 μm deep for wrought specimen. Pits on the wrought samples tended to be nearly hemispherical and polished with some pits showing crystallographic attack while pits on AM coupons exhibited preferential attack at melt pool boundaries and the cellular microstructure.

Effect of heat treatments on the microstructure of an ultrafine-grained Al-Zn-Mg alloy produced by powder metallurgy

2017 ◽  
Vol 685 ◽  
pp. 71-78 ◽  
Author(s):  
H. Queudet ◽  
S. Lemonnier ◽  
E. Barraud ◽  
J. Ghanbaja ◽  
N. Allain ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Heat Treatments ◽  
Mg Alloy ◽  
Ultrafine Grained

Effects of Heat Treatments on the Tensile and Corrosion Properties of Zircaloy 2

2009 ◽  
pp. 124-124-20
Author(s):  
J. G. Goodwin ◽  
L. S. Rubenstein ◽  
F. L. Shubert
Keyword(s):  
Heat Treatments ◽  
Corrosion Properties
Sign in / Sign up

Export Citation Format

Share Document