Localized corrosion of binary Mg-Ca alloy in 0.9 wt% sodium chloride solution

• To further understand the localized corrosion of magnesium alloy, various in situ electrochemical techniques and ex situ electron microprobe analysis and SEM were used to monitor the corrosion process of Mg-1.0Ca alloy in 0.9 wt% sodium chloride solution. The results indicated that the localized corrosion was accompanied by the formation and thickening of a corrosion product film on the Mg-1.0Ca alloy. A localized corrosion of the alloy initiated selectively on the eutectic micro-constituent zones, then enhanced with the exposure, developed in depth with ring-shaped corrosion products accumulated around and finally formed a volcanic-like pitting. Based on the measurements, an electrochemical corrosion model was proposed accordingly to describe the formation mechanism of the volcanic-like pitting on the alloy in 0.9 wt% sodium chloride solution.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Kemiteknik -- Korrosionsteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Chemical Engineering -- Corrosion Engineering (hsv//eng)

Nyckelord

Corrosion behavior

EIS

Magnesium alloy

Scanning reference electrode technique

Aluminum corrosion

Calcium

Calcium alloys

Corrosion

Corrosive effects

Electron probe microanalysis

Magnesium

Magnesium alloys

Microanalysis

Pitting

Sodium

Sodium chloride

Volcanoes

Corrosion product film

Corrosion products

Electrochemical techniques

Formation mechanism

Localized corrosion

Sodium chloride solution

Electrochemical corrosion

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