𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Galvanic compatibility of corrosion protective coatings with AA7075 aluminum alloy

✍ Scribed by Z. F. Lodhi; W. J. Hamer; J. M. C. Mol; H. Terryn; J. H. W. de Wit

Publisher
John Wiley and Sons
Year
2008
Tongue
German
Weight
131 KB
Volume
59
Category
Article
ISSN
0947-5117

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

The galvanic compatibility of aerospace aluminum alloy AA7075 with cadmium (Cd), zinc (Zn), and zinc–cobalt–iron (Zn–Co–Fe, 32–37%Co and 1%Fe) alloys was investigated. A comparison of open circuit potential [OCP vs. saturated calomel electrode (SCE)] measurements in 0.6 mM NaCl showed that all coatings would act anodically to AA7075 with an exception of Zn–Co–Fe (37%Co + 1%Fe) alloy which was electropositive to AA7075. During the zero resistance ammetry (ZRA) measurement in 0.6 M NaCl electrolyte the coupled OCP and current density were measured during 7 days of immersion and both Zn and Cd acted anodic and thus sacrificial to AA7075. Galvanic coupling of AA7075 with (37%Co + 1%Fe) Zn–Co–Fe alloy resulted in the consequent dissolution of the AA7075 aluminum alloy. In contrast, Zn–Co–Fe (32%Co + 1%Fe) alloy was found to be anodic to AA7075 during the first 26 h of immersion but after dezincification and cobalt enrichment at the surface became cathodic to the AA7075 aluminum alloy. During coupling with Zn, some pitting was also observed on AA7075.

📜 SIMILAR VOLUMES

Exfoliation corrosion of aluminum alloy
Exfoliation corrosion of aluminum alloy AA7075 examined by electrochemical impedance spectroscopy
✍ F.-H. Cao; Z. Zhang; J.-F. Li; Y.-L. Cheng; J.-Q. Zhang; C.-N. Cao 📂 Article 📅 2004 🏛 John Wiley and Sons 🌐 German ⚖ 352 KB

## Abstract A typical aluminum alloy, AA7075, was immersed in the EXCO solution, and its corrosion properties during different immersion time were measured repetitively using electrochemical impedance spectroscopy technique (EIS). The EIS data a were simulated using equivalent circuit with ZView pr

Development and characterization of sol-
Development and characterization of sol-gel composite coatings on aluminum alloys for corrosion protection
✍ Th. Lampke; S. Darwich; D. Nickel; B. Wielage 📂 Article 📅 2008 🏛 John Wiley and Sons 🌐 English ⚖ 253 KB

## Abstract For several years, Cr^IV^ compounds were used as effective and inexpensive corrosion inhibitors. Studies showed that these materials were toxic and carcinogenic. This has led to extensive research to develop alternative inhibitors. Organo‐silicate hybrid coatings appeared as an effectiv

Corrosion resistance of steel with hot-d
Corrosion resistance of steel with hot-dipped galvanized zinc and zinc alloy coatings in seawater
✍ Y. Li; J. Liu; J. Zhang; S. Chu 📂 Article 📅 2007 🏛 John Wiley and Sons 🌐 German ⚖ 64 KB

## Abstract Hot‐dipped galvanized zinc and zinc alloy coatings were used as protective metallic coatings for steel structures in seawater in China. Corrosion of the two coatings immersed in sea water in Qingdao and Xiamen for 6 years were introduced and analyzed, which provides a basis for further

Barrier and self-healing abilities of co
Barrier and self-healing abilities of corrosion protective polymer coatings and metal powders for aluminum alloys
✍ A. Yabuki; H. Yamagami; K. Noishiki 📂 Article 📅 2007 🏛 John Wiley and Sons 🌐 German ⚖ 227 KB

## Abstract Several types of coatings, designed to improve the resistance of aluminum alloys to corrosion in seawater, were examined. A coating with a thickness of approximately 30 μm was applied to the surface of aluminum alloy 3003, and after creating an artificial defect by means of a knife‐edge

Self-healing properties of TiO2 particle
Self-healing properties of TiO2 particle–polymer composite coatings for protection of aluminum alloys against corrosion in seawater
✍ A. Yabuki; W. Urushihara; J. Kinugasa; K. Sugano 📂 Article 📅 2010 🏛 John Wiley and Sons 🌐 German ⚖ 293 KB

## Abstract TiO~2~ particle–polymer composite coatings were applied to the surface of a 5083 aluminum alloy. After using a knife to create an artificial defect, polarization resistance was monitored in artificial seawater at a temperature of 30 °C. The polarization resistance of the specimen coated