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<p>The objective of this research is to evaluate the fatigue knockdowns of chromic and non-chromic anodizing on three alloys: 7050-T7451, 2195-T8, and 2050-T84. The anodize types include control (none), chromic, boric-sulfuric, and tartaric-sulfuric. Using a rotating-beam R.R. Moore machine, each alloy was tested at stress levels of 207&#xa0;MPa (30 ksi) and 345&#xa0;MPa (50 ksi). Specimens were tested in a fully reversed mode with an R ratio of − 1. The results indicate that the control specimens had a higher number of cycles to fracture overall; however, chromic anodizing presented the highest number of cycles for 2195-T8 at 207&#xa0;MPa (30 ksi). The 2195-T8 chromic specimens tested at 207&#xa0;MPa (30 ksi) had a knock-down factor (KDF) of 2.16, compared to the KDFs of the other anodize types. Control, non-anodized, specimens are expected to have the greatest fatigue life since there is no coating thickness; however chromic anodizing improves the fatigue life of 2195-T8. The average anodize thickness at each condition for 2195-T8 were 1.73&#xa0;µm (chromic), 3.18&#xa0;µm (tartaric-sulfuric), and 3.22&#xa0;µm (boric-sulfuric).</p>

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Fatigue Properties of Aluminum Alloys Anodized in Chromic Acid and Non-chromic Acid Baths

  • 期刊论文

  • 发表日期：

    2026年4月21日

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  • Ashley Kobylinski,
  • Kade Cochran,
  • Sarah Leka,
  • Joey Slaybaugh,
  • Jack Manion,
  • Omar S. Es-Said,
  • Mike Hahn,
  • Mark Timko,
  • Mike O’Brien,
  • Xiaodong Sun,
  • Tim Breman,
  • Yong-Jun Li,
  • Mustafa Mozael

摘要

The objective of this research is to evaluate the fatigue knockdowns of chromic and non-chromic anodizing on three alloys: 7050-T7451, 2195-T8, and 2050-T84. The anodize types include control (none), chromic, boric-sulfuric, and tartaric-sulfuric. Using a rotating-beam R.R. Moore machine, each alloy was tested at stress levels of 207 MPa (30 ksi) and 345 MPa (50 ksi). Specimens were tested in a fully reversed mode with an R ratio of − 1. The results indicate that the control specimens had a higher number of cycles to fracture overall; however, chromic anodizing presented the highest number of cycles for 2195-T8 at 207 MPa (30 ksi). The 2195-T8 chromic specimens tested at 207 MPa (30 ksi) had a knock-down factor (KDF) of 2.16, compared to the KDFs of the other anodize types. Control, non-anodized, specimens are expected to have the greatest fatigue life since there is no coating thickness; however chromic anodizing improves the fatigue life of 2195-T8. The average anodize thickness at each condition for 2195-T8 were 1.73 µm (chromic), 3.18 µm (tartaric-sulfuric), and 3.22 µm (boric-sulfuric).