Imam Abu Bakr (may Allah have mercy on him) says that in the narration of Sayyiduna Ibn Mas'ud (may Allah be pleased with him), the Noble Prophet (peace and blessings be upon him) delivered a sermon before the prayer as well. Therefore, the Imam should deliver a sermon before and after the eclipse prayer.
Hadith Referenceصحيح ابن خزيمه / جماع أبواب صلاة الكسوف / 1396