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We study, for the first time in a statistically significant and well-definedsample, the relation between the outer-disk ionized-gas metallicity gradientsand the presence of breaks in the surface brightness profiles of disk galaxies.SDSS g'- and r'-band surface brightness, (g'- r') color, and ionized-gas oxygenabundance profiles for 324 galaxies within the CALIFA survey are used for thispurpose. We perform a detailed light-profile classification finding that 84% ofour disks show down- or up-bending profiles (Type II and Type III,respectively) while the remaining 16% are well fitted by one single exponential(Type I). The analysis of the color gradients at both sides of this break showsa U-shaped profile for most Type II galaxies with an average minimum (g'- r')color of ~0.5 mag and a ionized-gas metallicity flattening associated to itonly in the case of low-mass galaxies. More massive systems show a ratheruniform negative metallicity gradient. The correlation between metallicityflattening and stellar mass results in p-values as low as 0.01. Independentlyof the mechanism having shaped the outer light profiles of these galaxies,stellar migration or a previous episode of star formation in a shrinkingstar-forming disk, it is clear that the imprint in their ionized-gasmetallicity was different for low- and high-mass Type II galaxies. In the caseof Type III disks, a positive correlation between the change in color andabundance gradient is found (the null hypothesis is ruled out with a p-value of0.02), with the outer disks of Type III galaxies with masses $\leq$10$^{10}$M$_{\odot}$ showing a weak color reddening or even a bluing. This isinterpreted as primarily due to a mass down-sizing effect on the population ofType III galaxies having recently experienced an enhanced inside-out growth.

Outer-disk reddening and gas-phase metallicities: The CALIFA connection