Short-term exposure tests of γ-Al2O3 Sol-gel coating on X20Cr13 in artificial geothermal waters with different pH

被引：3

作者：

Aristia, Gabriela ^{[1
]}

Baessler, Ralph ^{[1
]}

Nofz, Marianne ^{[1
]}

Sojref, Regine ^{[1
]}

Kohl, Anka ^{[1
]}

机构：

[1] Bundesanstalt Mat & Prufung, Unter Eichen 87, D-12205 Berlin, Germany

来源：

GEOTHERMICS | 2021年 / 96卷

关键词：

Al2O3; Corrosion; Coatings; Martensitic steel; HEAT-TREATMENT; GAMMA-ALUMINA; CORROSION BEHAVIOR; STEEL; HYDRATION; BOEHMITE;

D O I：

10.1016/j.geothermics.2021.102193

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

The suitability of an Al2O3 coating for corrosion protection on X20Cr13 was evaluated in various artificial geothermal brines, focusing on the influence of different pH (4, 6, and 8) and their chemical compositions on the coating properties. All experiments were performed in the laboratory using autoclaves at 150 degrees C and 1 MPa in deaerated condition for 1 and 7 days. Results showed that the pH of geothermal waters is the most detrimental factor in the transformation of gamma-Al2O3 and its protective abilities. Delaminations were found in the coating exposed to geothermal brines with pH 4. FTIR spectra indicated a transformation of gamma-Al2O3 to boehmite AlOOH after exposure to pH 4 and 6, and bayerite Al(OH)3 was formed after exposure to pH 8. Different crystal structures of the hydrated Al2O3 also contribute to the stability of the coatings, observed by the SEM- EDX of the surface and cross-section of coatings. This study indicated that gamma-Al2O3 sol-gel coating presents a promising aspect of corrosion protection in geothermal environment with a neutral pH.

引用

页数：9

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