SUMMARY Electrolytic codeposition is a promising alternative low-cost process for fabricating MCrAlY coatings. In this process, CrAlY particles are codeposited with the (Ni,Co) to form an (Ni,Co)-CrAlY composite coating, which is subsequently heat treated at elevated temperatures to be transformed to the MCrAlY coating containing phases of β-NiAl, γ-(Ni,Co), etc. Two types of CrAlY-based particles (made by ball milling and gas atomization) were employed. The effects of several key processing parameters, such as current density, particle loading, and particle size/shape density, on the CrAlY particle incorporation in the electrodeposited (Ni,Co)-CrAlY coatings were studied. For the ball-milled CrAlY powder, an increase in current density led to a decrease in particle incorporation, whereas for the gas-atomized CrAlY powder the current density showed a negligible influence on particle incorporation. The relationship of particle incorporation and particle loading followed the Langmuir adsorption isotherm. One of the most important findings was that the particle properties played a critical role in affecting particle incorporation. For CrAlY particles of similar size, the spherical-shaped particles led to higher incorporation than the irregular particles. This was likely because fewer electrolyte ions were adsorbed on the particles with smaller specific surface areas, leading to the higher specimen-particle adsorption strength. In addition, sulfur-free plating solutions were explored in the electro-codeposition process, since the MCrAlY coatings plated in a Watts bath typically contain a trace amount of sulfur, which could adversely affect the high-temperature oxidation resistance. Preliminary oxidation testing was conducted at 1100°C to evaluate the oxidation performance of the coatings plated in the sulfur-free solutions.