Morphology perspective on chromic acid anodizing replacement by thin film sulfuric acid anodizing

Characterization of Anodic Films Produced on Anodized AA1050 Aluminum Alloy: Effect of Bio-additive

“…In this regard, since addition of eggshell particles to bath would result in enhanced consumption of free H + ions (as discussed above), it would also result in accelerated rate of passive film formation (obtaining thicker films) by enhancing the occurrence of Eq. [4]. It is in agreement with chronoamperometry test results attributed to the anodizing experiments implemented in baths containing different amounts of eggshell particles (Figure 3) where more current densities are attributed to the anodizing experiments implemented in baths containing more eggshell particles.…”

“…[1][2][3] The corrosion and wear resistance of aluminum can be improved by the formation of an uniform oxide layer on its surface. [4][5][6] One of the practical techniques to produce a uniform oxide layer on aluminum surface is anodizing, which is an electrochemical method performing in different types of electrolytes. [4,7] Common electrolytes used in aluminum anodizing process are aqueous solutions of sulfuric acid, [7][8][9][10][11][12] phosphoric acid, [9,11,13] oxalic acid, [9,11,12,14] and chromic acid.…”

“…[4][5][6] One of the practical techniques to produce a uniform oxide layer on aluminum surface is anodizing, which is an electrochemical method performing in different types of electrolytes. [4,7] Common electrolytes used in aluminum anodizing process are aqueous solutions of sulfuric acid, [7][8][9][10][11][12] phosphoric acid, [9,11,13] oxalic acid, [9,11,12,14] and chromic acid. [9,11,15,16] Sulfuric acid electrolytes are more common due to their low cost, availability, and ability to form oxide films with appropriate properties.…”

“…[18][19][20][21] In addition, presence of solid particles in the electrolyte can also influence coatings properties. [4,9] For instance, it has been reported that anodizing of aluminum in baths containing different types of solid particles such as Al 2 O 3 /PTFE, [22] SiC/PTFE, [23] and also additives like Na 2 SO 4 , [24] Ce 2 (SO 4 ) 3 and Nd (NO 3 ) 3 [25] influences the morphology, anodizing efficiency, crystal structure, chemical composition, corrosion, and wear resistance of the resulting coatings.…”

The long‐term corrosion performance and adhesion properties of 7B04 aluminum alloy/anodic film/epoxy primer system in acidic NaCl solution

“…[ 1–3 ] Among the existing pretreatment methods, anodizing technology is relatively mature and has been widely used in aerospace industries. [ 4–7 ] Using organic coatings to protect aluminum alloys has been considered an economically feasible and suitable method in the past decades. [ 3 ] Currently, chromium‐free high‐solids epoxy primers are being used more and more to meet the requirements of environmental protection and corrosion resistance in aerospace industries.…”