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(ABRIDGED) Globular clusters trace the formation and evolution of the MilkyWay and surrounding galaxies, and outline their chemical enrichment history. Toaccomplish these tasks it is important to have large samples of clusters withhomogeneous data and analysis to derive kinematics, chemical abundances, agesand locations. We obtain homogeneous metallicities and alpha-elementenhancement for over 800 red giant stars in 51 Galactic bulge, disc, and haloglobular clusters that are among the most distant and/or highly reddened in theGalaxy's globular cluster system. We observed R ~ 2000 spectra in thewavelength interval 456-586 nm and applied full spectrum fitting technique. Wecompared the mean abundances of all clusters with previous work and with fieldstars. We used the relation between mean metallicity and horizontal branchmorphology defined by all clusters to select outliers for discussion. We findour metallicities are comparable to those derived from high-resolution data towithin sigma = 0.08 dex over the interval -2.5 < [Fe/H] < 0.0. We also findthat the distribution of [Mg/Fe] and [alpha/Fe] with [Fe/H] for the 51 clustersfollows the general trend exhibited by field stars. It is the first time thatthe following clusters have been included in a large sample of homogeneousstellar spectroscopic observations and metallicity derivation: BH 176, Djorg 2,Pal 10, NGC 6426, Lynga 7, and Terzan 8. In particular, only photometricmetallicities were available previously for the first three clusters, and theavailable metallicity for NGC 6426 was based on integrated spectroscopy andphotometry. Two other clusters, HP 1 and NGC 6558, are confirmed as candidatesfor the oldest globular clusters in the Milky Way. The technique used here canalso be applied to globular cluster systems in nearby galaxies with currentinstruments and to distant galaxies with the advent of ELTs.

FORS2/VLT survey of Milky Way globular clusters II. Fe and Mg abundances of 51 Milky Way globular clusters on a homogeneous scale