Effect of corrosion inhibiting compounds on the corrosion behaviour of pure magnesium and the magnesium alloys EV31A, WE43B and ZE41A

Influence of commercial corrosion‐inhibiting compounds on the atmospheric corrosion of the magnesium alloys EV31A, WE43B, ZE41A and pure magnesium

“…FTIR analysis confirmed the presence of medium aliphatic alkanes, with saturated esters, heterocyclic ring compounds and calcium carbonate. [29] The considerable reduction in corrosion rates afforded by LPS 3 was attributed to a thicker more-durable barrier film formed by chemical adsorption of long-chain close-packed aromatic hydrocarbons present in the CIC in agreement with the studies performed on other metals. [51][52][53][54] However, the atmospheric exposure for 6 months and longer resulted in a considerable decrease in inhibitor efficiency reflected by the typical increase in the corrosion rate.…”

“…Previous FTIR analysis confirmed the presence of aromatic carboxyl, ester and alkane. [29] The substantial reduction in corrosion rates with inhibitor efficiencies of above 77% in all cases was attributed to a thicker, denser, more-durable barrier film formed by the aromatic hydrocarbons, by chemical adsorption, in a manner similar to LPS 3 with better inhibition. AMLGuard largely retained superior inhibition properties even after 12 months of exposure with a relatively minor reduction in inhibitor efficiencies at both sites.…”

“…T A B L E 11 Average mass loss ∆m Ave inh and corresponding efficiency values η for all alloys and all coatings tested in 3.5 wt.% (0.6M) NaCl solution saturated with Mg(OH) 2 with and without coating for periods of 7, 14 and 21 days [29] Coating…”

“…Likewise, the areas of high corrosion were similar. Table 11 provides corresponding inhibition data for immersion testing in 3.5 wt.% (0.6 M) NaCl solution saturated with Mg(OH) 2 from the prior research of Soltan et al [29] Both immersion testing (Table 11) and atmospheric corrosion exposures (Table 9) indicated that Ardrox 3961 and LPS 2 were less effective as CICs, whereas LPS 3 and AMLGuard were more effective CICs. LPS 3 was more effective for (short-term) solution exposures, whereas AMLGuard provided better overall protection to the atmospheric exposures.…”

“…Soltan et al [ 29 ] studied the influence of these four CICs (Ardrox 3961, LPS 2, LPS 3 and AMLGuard) on the corrosion behaviour of EV31A, WE43B and ZE41A in 3.5 wt.% NaCl solution saturated with Mg(OH) 2 . LPS 3 was most protective and resulted in 100% inhibition in most cases.…”