To find articles on Legal Ethics within general legal periodicals, use the index/table of contents or search the databases (EBSCO, NexisUni) using specific search terms.
The following titles are general legal periodicals:
ABA Journal (library has print- 2012-present, and online access)
Peer-reviewed coverage of empirical research on the ethics and conduct of the legal professions and judiciary studies of legal ethics education and moral development and jurisprudential and wider philosophical reflections on law as an ethical system.
From the publishers website: "The Journal strives to publish cutting edge articles on ethical issues, facilitate symposia that include legal scholars, attorneys from diverse practice areas, judges, and social scientists."
The American Bar Association Center for Professional Responsibility provides links to state ethical codes and other countries legal ethical codes. They also have a page on the ABA Model Rules for Professional Conduct.