TY - JOUR
T1 - Characterization of cerium-based conversion coatings for corrosion protection of AISI-1010 commercial carbon steel
AU - Onofre-Bustamante, E.
AU - Domínguez-Crespo, M. A.
AU - Torres-Huerta, A. M.
AU - Olvera-Martínez, A.
AU - Genescá-Llongueras, J.
AU - Rodríguez-Gómez, F. J.
N1 - Funding Information:
The authors wish to acknowledge the financial support given by UNAM through the DGAPA PAPIIT IN 115603-project, DGAPA-UNAM, and CONACYT through the 61354 project. The authors would like to thank Mr. Ivan Puente L. for the SEM analyses.
PY - 2009/11
Y1 - 2009/11
N2 - The role of hydrogen peroxide in the formation of cerium conversion coatings by immersing AISI 1010 commercial carbon steel substrates into solutions containing various concentrations of CeCl 3 (0.1, 1, and 10 g L -1) has been investigated as an alternative method for their protection against corrosion. The deposits prepared from the solutions with H 2O 2 consist of yellow thin and non-uniform coatings with agglomerates of small CeO 2 and Ce 2O 3 crystallites whose sizes increased over the metallic surface as the cerium concentration was increased. Cerium pre-treatments in the presence of H 2O 2 displayed layers that were rougher than those synthesized without H 2O 2. A comparison with the chromate conversion pre-treatment is also simultaneously carried out with the discussion of the possible reactions involved in the different stages of process. The coating obtained from the solution containing 0.1 g in 1,000 mL produced better corrosion resistance on the substrate than that observed for its counterparts due to the fact that the surface was more uniformly covered by the conversion coating. The addition of H 2O 2 to the cerate baths improves visible roughness, corrosion resistance of the conversion coatings and bond strength because hydrogen peroxide acts as an oxygen source during the formation of the coatings.
AB - The role of hydrogen peroxide in the formation of cerium conversion coatings by immersing AISI 1010 commercial carbon steel substrates into solutions containing various concentrations of CeCl 3 (0.1, 1, and 10 g L -1) has been investigated as an alternative method for their protection against corrosion. The deposits prepared from the solutions with H 2O 2 consist of yellow thin and non-uniform coatings with agglomerates of small CeO 2 and Ce 2O 3 crystallites whose sizes increased over the metallic surface as the cerium concentration was increased. Cerium pre-treatments in the presence of H 2O 2 displayed layers that were rougher than those synthesized without H 2O 2. A comparison with the chromate conversion pre-treatment is also simultaneously carried out with the discussion of the possible reactions involved in the different stages of process. The coating obtained from the solution containing 0.1 g in 1,000 mL produced better corrosion resistance on the substrate than that observed for its counterparts due to the fact that the surface was more uniformly covered by the conversion coating. The addition of H 2O 2 to the cerate baths improves visible roughness, corrosion resistance of the conversion coatings and bond strength because hydrogen peroxide acts as an oxygen source during the formation of the coatings.
KW - Cerium salts
KW - Chemical conversion coatings
KW - Corrosion properties
KW - Hydrogen peroxide
UR - http://www.scopus.com/inward/record.url?scp=69549111045&partnerID=8YFLogxK
U2 - 10.1007/s10008-009-0871-9
DO - 10.1007/s10008-009-0871-9
M3 - Artículo
AN - SCOPUS:69549111045
SN - 1432-8488
VL - 13
SP - 1785
EP - 1799
JO - Journal of Solid State Electrochemistry
JF - Journal of Solid State Electrochemistry
IS - 11
ER -