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I don't think L would have been corrupted had he used it; part of the point of the Yotsuba Arc is to show that Light was a good guy, but that his ideals were already laying the groundwork for his corruption. Light, even before finding the Death Note, thought that the world needed to be "cleaned up" in a very dramatic way. So, when he gets a killing tool unprecedented in human experience, he starts aggressively pursuing what he believed might be right all along.
L meanwhile is all about upholding the law and punishing criminals within the confines of the justice system (he may stretch the rules a little bit when it comes to catching them, but he doesn't believe it's his place to judge them, hence why he's not all that interested in the conversations about what will be done with Kira after he's caught). And that's why despite the ruthlessness of some of his moves (sacrificing Lind L. Tailor, for instance), the Death Note would not corrupt him. He's not after power, unlike Light/Kira.
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