Analysis of Corrosion Products Formed on Copper in Cl2 /  H 2 S  /  NO 2 Exposure

Abstract

A joint effort has been undertaken, involving four laboratories and nine different analytical techniques, aiming at characterizing corrosion products on copper formed in mixed flowing gas test containing Cl~, H~S, and NO2. The results and considerations clearly show that the identification of different crystalline or noncrystalline phases in the corrosion products only can be performed by a combination of independently working analytical techniques. Cuprite, Cu20, is the dominating phase during initial exposure, whereas cuprite together with atacamite, Cu2CI(OH)3, are the most abundant phases after 10 days of exposure. In addition, the corrosion products contain minor amounts of sulfide, Cu2S, sulfate, most likely as posjnakite, Cu4SO4(OH)6 9 H20, and nitrate, most likely as gerhardite, Cu2NO3(OH)3. A nonstoichiometric cuprous oxide, Cu302, has also been detected by several techniques.

Effect of Cast Defects on the Corrosion Behavior and Mechanism of UNS C95810 Alloy in Artificial Seawater

“…In the XRD tests, Cu(OH,Cl) 2 and Cu 2 (OH) 3 Cl are detected in the corrosion products of S-Cast and S-Defect. They could form by the following reactions [13,25,26,28]:…”

“…In the XRD tests, Cu(OH,Cl)2 and Cu2(OH)3Cl are detected in the corrosion products of S-Cast and S-Defect. They could form by the following reactions [13,25,26,28]: According to Song's research [21] on a NAB corrosion product film, Cu2(OH)3Cl was located in the outer layer of the NAB corrosion product film. In the structure of the NAB corrosion product film proposed by Du [22], Cu(OH)2 or CuO was located between Cu2O and Cu2(OH)3Cl.…”

Accelerated Testing of Electronics to Simulate Long‐Term Worldwide Environments

“…Field studies and laboratory corrosion tests have been carried out to identify not only the corrosion products of pure metals (such as Cu [17] and Ni [18]) but also the corrosion products of relevant engineering alloys (such as stainless steels [19] and Cu-Au-Sn [20]). However, few studies have been undertaken to explore the corrosion of electronic equipment and devices deployed in harsh environments (typically exposed to Class III or harsher environments).…”

Corrosion mechanism of copper immersed in ammonium sulfate solution

“…With desirable electrical conductivity, thermal conductivity, stable chemical properties, good ductility, and plasticity, copper and its alloys are widely used in the fields of electricity, electronics, transportation, energy, marine industry, etc. However, the copper would be corroded by some polluted gases and salt particulates after exposure in the ambient atmosphere, which can reduce its service life. One of the common salt particles within the rural and industrial atmosphere is (NH 4 ) 2 SO 4 , which would be dissolved to form a thin (NH 4 ) 2 SO 4 solution layer on copper surface when the ambient humidity gets greater than the critical relative humidity of (NH 4 ) 2 SO 4 and consequently gives rise to the corrosion of copper .…”