Corrigendum on: Formation of a protective layer against corrosion on Mg alloy via alkali pretreatment followed by vanillic acid treatment

In the article by Sheng Li et al., published in Materials and Corrosion, 2020;71:1330–1338, https://doi.org/10.1002/maco.201911488, reference should have been made to work Abatti Conversion coating on magnesium alloy sheet (AZ31) vanillic acid treatment: Preparation, characterization corrosion behavior, J. Alloys Compd. 2018, 738, 224–232.[ 1 ] The treatment was adapted from this study. following, information relevant references are added. additions marked bold. Commercial AZ31 Mg with nominal mass composition of 0.007 Fe, 0.004 Mn, 2.98 Al, 0.005 Ni, 0.97 Zn, 0.02 Si, 0.05 Ca (wt%), bal. obtained Dongguan Jiazhou Metal Co. cut into squares. It firstly mechanically polished 1600 grit using SiC paper, then cleaned acetone, distilled water, absolute ethanol ultrasound. All samples subsequently were dried hot air before further characterization. NaOH purchased Shanghai Chemical Reagent. Vanillic (4-hydroxy-3-methoxybenzoic acid) Jizhi Biochemical Technology These chemicals employed without purification. al. [ To produce a protective layer (chemical conversion-coating) alloy, substrate surface needed carry net negative charge. Hence, process producing involved two steps, schematic diagrams for exhibited Figure 1.[ 2, 3 first treated aqueous solution (1.0 mol/L) 1.5 h abundant hydroxyl ion (–OH) hydroxylation process, which acted as reactive group facilitated uniform vanillate formation. subsequent step that NaOH-treated immersed 24 at room temperature mmol/L). end, washed alcohol again 100°C under vacuum.[ study, used materials denoted (polished), AZ31N (treated NaOH), AZ31V acid).