In industrial environment, many materials are subjected to the abrasion-corrosion phenomenon. In such cases, stainless steels are often used for their good corrosion resistance. However, the synergistic effect between abrasion and corrosion may be a serious contributor to the total wear even when pure corrosion rates do not appear to be significant. In order to select the more resistant alloy for each particular application, it is important to understand this phenomenon. This paper presents a study on the characterization by acoustic emission and electrochemical techniques of AISI 304L stainless steel abrasion-corrosion, in saline environment. The abrasion mechanism is first examined for three angles of impingement in non-corrosive conditions. Then, the synergistic effect between mechanical damage and corrosion is investigated. The results indicate that the lower the impingement angle, the lower is the mechanical contribution. In corrosive conditions, it is shown that, at low abrasion rate, the synergistic effect depends on the impingement angle. Some hypothesis are proposed in order to separate, in the overall synergistic damage, the effect of abrasion on corrosion and the effect of corrosion on abrasion.