Among all thermochemical materials for thermal energy storage salt hydrates seem to be the most promising ones. Salt hydrates present the highest energy densities, but their main drawback is their bad compatibility with some container materials, such as metals. To control the corrosion effect it is necessary to perform and evaluate experimental tests. The main goal of this paper is to show experimental results of corrosion test between the most used salt hydrates for thermochemical energy storage and the most common vessel metals. The research leading to these results has received funding from the European Commission Seventh Framework Programme (FP/2007-2013) under grant agreement No ENER/FP7/295983 (MERITS). Aran Solé would like to thank the Departament d'Universitats, Recerca i Societat de la Informació de la Generalitat de Catalunya for her research fellowship. Laia Miró would like to thank the Spanish Government for her training researcher personal fellowship (BES-2012-051861).The work is partially funded by the Spanish government (ENE2011-28269-C03-02 and ENE2011-22722). The authors would like to thank the Catalan Government for the quality accreditation given to their research groups GREA (2009 SGR 534) and research group DIOPMA (2009 SGR 645).