Influence of injection temperature and pressure on the microstructure, mechanical and corrosion properties of a AlSiCu alloy processed by HPDC

Santos, Sofia; Antunes, Renato Altobelli; Santos, Sydney Ferreira

doi:10.1016/j.matdes.2015.09.095

Cited by 39 publications

(27 citation statements)

References 49 publications

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“…EN AC‐46000 showed a different corrosion morphology related to the elevate amount of Al‐Cu particles spread into the matrix and to the presence of sludge (Figure ), not observed in the other alloys. Indeed, the intermetallic particles exert great contribution to the formation of galvanic particles and are the main responsible for the pit formation, as already evidenced in previous works …”

Section: Resultssupporting

confidence: 63%

“…Although the use of these new materials is increasing in the automotive field, their corrosion behavior is still not well investigated. Indeed, while mechanical and microstructural properties of aluminum HPDC alloys are frequently analyzed, the information about their corrosion is generally scarcer, as lately evidenced in some works . In particular, recent exception can be found in dos Santos et al that studied the relation between process parameters and corrosion behavior of the traditional HPDC AlSi9Cu3 alloy.…”

Section: Introductionmentioning

confidence: 99%

“…Indeed, while mechanical and microstructural properties of aluminum HPDC alloys are frequently analyzed, the information about their corrosion is generally scarcer, as lately evidenced in some works . In particular, recent exception can be found in dos Santos et al that studied the relation between process parameters and corrosion behavior of the traditional HPDC AlSi9Cu3 alloy. Hu et al analyzed the corrosion resistance and the corrosion fatigue of another class of HPDC alloys, AlMgSiMn.…”

Section: Introductionmentioning

confidence: 99%

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Corrosion behavior of primary and secondary AlSi high pressure die casting alloys

Cecchel

Cornacchia

Gelfi

2017

Materials & Corrosion

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This work characterized and compared the corrosion resistance of a traditional secondary HPDC AlSiCu alloy with two innovative AlSi low‐Cu and low‐Fe ones. Samples were collected from both the bulk and the skin of castings to evaluate the differences. Potentiodynamic tests were performed in 3.5% NaCl and 0.05 M Borax + 0.01 M NaCl water solutions and microstructural analyses have been carried out. The results demonstrated the higher corrosion resistance of the two innovative alloys tested. Skin surface showed a worse resistance compared to bulk, especially for the traditional AlSiCu alloy.

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Section: Resultssupporting

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Corrosion behavior of primary and secondary AlSi high pressure die casting alloys

Cecchel

Cornacchia

Gelfi

2017

Materials & Corrosion

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“…CP-Al presents nobler corrosion potential than that of the Al-Co alloys. However, its corrosion potential is just a few decades of mV lower than its pitting potential (E b in Table 3), as has also been observed in other Al-alloys [57,58]. This behavior is consistent with the fact that Al-alloys in aerated halide solutions usually present corrosion potentials close to their pitting potentials, suggesting that the cathodic oxygen reduction, largely within the flawed regions, is sufficient to raise the corrosion potential to the pitting potential [59].…”

Section: Polarization Behavior Of Cp-alsupporting

confidence: 65%

Al-Co Alloys Prepared by Vacuum Arc Melting: Correlating Microstructure Evolution and Aqueous Corrosion Behavior with Co Content

Lekatou

Sfikas

Petsa

et al. 2016

Metals

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Hypereutectic Al-Co alloys of various Co contents (7-20 weight % (wt.%) Co) were prepared by vacuum arc melting, aiming at investigating the influence of the cobalt content on the microstructure and corrosion behavior. Quite uniform and directional microstructures were attained. The obtained microstructures depended on the Co content, ranging from fully eutectic growth (7 wt.% and 10 wt.% Co) to coarse primary Al 9 Co 2 predominance (20 wt.% Co). Co dissolution in Al far exceeded the negligible equilibrium solubility of Co in Al; however, it was hardly uniform. By increasing the cobalt content, the fraction and coarseness of Al 9 Co 2 , the content of Co dissolved in the Al matrix, and the hardness and porosity of the alloy increased. All alloys exhibited similar corrosion behavior in 3.5 wt.% NaCl with high resistance to localized corrosion. Al-7 wt.% Co showed slightly superior corrosion resistance than the other compositions in terms of relatively low corrosion rate, relatively low passivation current density and scarcity of stress corrosion cracking indications. All Al-Co compositions demonstrated substantially higher resistance to localized corrosion than commercially pure Al produced by casting, cold rolling and arc melting. A corrosion mechanism was formulated. Surface films were identified.

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“…These two factors reduce respectively the effect of uneven distribution of porosity and intermetallics in the samples and the potential local and transient events that decrease the reliability of electrochemical analysis. Indeed, porosities and intermetallics, that are widely present in castings, exert a great contribution to the formation of local galvanic effects and are the main responsible for the pit formation, as already evidenced in previous works …”

Section: Resultssupporting

confidence: 60%

A study of a non‐conventional evaluation of results from salt spray test of aluminum High Pressure Die Casting alloys for automotive components

Cecchel

Cornacchia

Gelfi

2018

Materials & Corrosion

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Aim of the present work was to investigate in a non‐conventional way the results of aluminum castings salt spray tests. These experiments were engineered in order to obtain a quantitative measurement of the corrosion rate, instead of the qualitative visual analysis usually employed in the traditional salt spray test. These tests were performed on aluminum EN AC‐46000, EN AC‐44400, and EN AC‐43500 samples. A comparison was made with electrochemical tests on specimens and the traditional salt spray testing on a real dimension component. The results showed a good reliability of the new method that gave outputs in agreement with the electrochemical technique. The new concept of salt spray test data processing was able to detect very small differences in corrosion behavior of tested alloys, demonstrating higher precision and reliability in respect to the polarization technique. Such result was explained considering the adoption of specimen with larger area and longer time of exposure to the selected corrosive environment that reduce respectively the effect of uneven distribution of porosity and intermetallics in the samples, typical of aluminum castings, and the potential local and transient events related to these defects.

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Influence of injection temperature and pressure on the microstructure, mechanical and corrosion properties of a AlSiCu alloy processed by HPDC

Cited by 39 publications

References 49 publications

Corrosion behavior of primary and secondary AlSi high pressure die casting alloys

Corrosion behavior of primary and secondary AlSi high pressure die casting alloys

Al-Co Alloys Prepared by Vacuum Arc Melting: Correlating Microstructure Evolution and Aqueous Corrosion Behavior with Co Content

A study of a non‐conventional evaluation of results from salt spray test of aluminum High Pressure Die Casting alloys for automotive components

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