Details

Autor(en) / Beteiligte

• Xu, Xingxin
• Huang, Hualiang

Titel

The corrosion inhibition mechanism of Ca(HPO) on AZ91D magnesium alloy in 3.5 wt% NaCl solution

Ist Teil von

• New journal of chemistry, 2023-10, Vol.47 (42), p.19726-19736

Erscheinungsjahr

2023

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• In this work, Ca(H 2 PO 4 ) 2 was used as a green corrosion inhibitor for AZ91D magnesium alloy in 3.5 wt% NaCl solution. The corrosion inhibition behavior and mechanism were analyzed using electrochemical tests, high-definition video measuring microscopy, scanning electron microscopy (SEM), energy dispersive spectrometry (EDS) and X-ray diffraction (XRD). The electrochemical testing results showed that the optimal corrosion inhibition concentration of Ca(H 2 PO 4 ) 2 was 0.6 g L −1 , and the highest corrosion inhibition efficiency was 89.29% after 48 h immersion in the corrosive medium. Optical microscopy and SEM images showed that an obvious protective film formed on the Mg alloy surface in solution inhibited with Ca(H 2 PO 4 ) 2 . EDS and XRD results showed that the protective layer was composed of Mg(OH) 2 + MgHPO 4 + Ca 3 PO 4 , and MgHPO 4 played a major role. The precipitation mechanism of Ca(H 2 PO 4 ) 2 as a corrosion inhibitor was proposed. In this work, Ca(H 2 PO 4 ) 2 was used as a green corrosion inhibitor for AZ91D magnesium alloy in 3.5 wt% NaCl solution.