Effect of Trace Chloride and Temperature on Electrochemical Corrosion Behavior of 7150-T76 Al Alloy

doi:10.11902/1005.4537.2015.051

Journal of Chinese Society for Corrosion and protection

2016, Vol. 36

Issue (2): 121-129 DOI: 10.11902/1005.4537.2015.051

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Effect of Trace Chloride and Temperature on Electrochemical Corrosion Behavior of 7150-T76 Al Alloy

Qingqing SUN^1,^2,³,Wenhui ZHOU¹,Yuehuang XIE²,Pengxuan DONG²,Kanghua CHEN²,Qiyuan CHEN¹(

)

1. Key Laboratory of Resource Chemistry of Nonferrous Metals, Ministry of Education, Central South University, Changsha 410083, China
2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
3. School of Chemical Engineering, Purdue University, West Lafayette 47906, USA

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Abstract

3.5%(mass fraction) NaCl has been intensively used as an electrolyte for evaluating the corrosion behavior Al-alloys for decades due to the simulated sea water being close to the real service environment, particularly for the carrier-based aircrafts. But this medium has several limitations such as the lack of acid substances and the absence of pitting potentials in polarization curves for some alloys. According to Arrhenius equation, the corrosion rate is promoted by temperature. In fact, one of the most crucial factors in the corrosion of Al alloys is temperature which has a strong impact on the stability and properties of passive films. In the present work, the influence of trace Cl^- and temperature on the electrochemical corrosion of 7150-T76 Al alloy was investigated by measurements of open circuit potentials (OCP) and cyclic polarization curves as well as observation of corrosion morphology. The results showed that the localized corrosion of 7150 Al alloy was promoted by the increase of Cl^- concentration and temperature. In the solutions with relatively low temperature and low chloride concentration, pitting corrosion was the main corrosion form, while for higher temperature and higher chloride concentration, the corrosion of the alloy gradually turned to be intergranular corrosion. The presence of pit transition potential E_ptp reflects a step-wise propagation of corrosion on very narrow fronts with a sequence of active tip-passive walls. OCP shifts to the negative direction with the increase of Cl^- concentration and temperature, respectively. Moreover, OCP decreased drastically with increasing temperature above 60 ℃, indicating the chan-ge of corrosion mechanism in the temperature range from 60 to 70 ℃. In the medium of 0.1 mol/L Na₂SO₄+1 mmol/L NaCl, the free corrosion potential decreased, while the free corrosion current density increased firstly and then decreased with the increase of temperature due to less dissolved oxygen at higher temperatures. Differences between potential parameters such as ΔE₁(E_pit-E_corr), ΔE₂ (E_corr-E_ptp) and ΔE₃(E_corr-E_rep) were determined as criteria to assess localized corrosion. The value of ΔE₃(E_corr-E_rep) increased linearly with the increase of Cl^- concentration. However, ΔE₃ showed a turning point at 70 ℃ because uniform corrosion occurred at 80 ℃ as deduced from corrosion morphology. It can be concluded that ΔE₃(E_corr-E_rep) only increases linearly with the corrosion propagation at the first stage of localized corrosion.

Key words: 7150 Al alloy trace Cl- temperature cyclic polarization potential parameter

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	Qingqing SUN
	Wenhui ZHOU
	Yuehuang XIE
	Pengxuan DONG
	Kanghua CHEN
	Qiyuan CHEN

Cite this article:

Qingqing SUN,Wenhui ZHOU,Yuehuang XIE,Pengxuan DONG,Kanghua CHEN,Qiyuan CHEN. Effect of Trace Chloride and Temperature on Electrochemical Corrosion Behavior of 7150-T76 Al Alloy. Journal of Chinese Society for Corrosion and protection, 2016, 36(2): 121-129.

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https://www.jcscp.org/EN/10.11902/1005.4537.2015.051 OR https://www.jcscp.org/EN/Y2016/V36/I2/121

Fig.1 OCP vs time curves of 7150AA in electrolyte solutions containing different Cl^- concentrations

Fig.2 Cyclic polarization curves of 7150AA in 3.5%NaCl solution

Fig.3 Cyclic polarization curves of 7150AA as a function of Cl^- concentration

Fig.4 Corrosion current densities I_corr and I_rep (a), limit current density at reverse potential (b), current densities corresponding to E_pit and E_ptp (c), and linear polarization resistances R_corr and R_rep (d) of 7150AA as a function of Cl^- concentration

Fig.5 E_corr(a), E_pit(b), E_ptp(c), and E_rep(d) of cyclic polarization curves as a function of Cl^- concentration

Fig.6 ΔE₁ (a), ΔE₂ (b) and ΔE₃ (c) as a function of Cl^- concentration

Fig.7 Corrosion morphologies of Al alloy specimens after cyclic polarization in electrolyte solutions with 0 mmol/L (a), 20 mmol/L (b), 50 mmol/L (c) and 100 mmol/L (d) Cl^-

Fig.8 OCP vs time curves of 7150AA in 0.1 mol/L Na₂SO₄+1 mmol/L NaCl solution at different temperatures

Fig.9 Cyclic polarization curves of 7150AA in 0.1 mol/L Na₂SO₄+1 mmol/L NaCl solution at 30 ℃ (a), 40 ℃ (b), 50 ℃ (c), 60 ℃ (d), 70 ℃ (e) and 80 ℃ (f)

Fig.10 I_corr and I_rep (a), I_rev (b) and R_corr and R_rep (c) of 7150AA as a function of temperature

Fig.11 E_corr (a), E_rep (b) and ΔE₃ (c) of cyclic polarization curves as a function of temperature

Fig.12 Corrosion morphologies of 7150AA after cyclic polarization in 0.1 mol/L Na₂SO₄+1 mmol/L NaCl solution at 30 ℃ (a, a'), 40 ℃ (b), 50 ℃ (c), 60 ℃ (d), 70 ℃ (e, e') and 80 ℃ (f)

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