Combine the lime juice, olive oil, garlic, chili powder, black pepper, and salt. Stir well.
Transfer the quinoa to a large mixing bowl, then stir in the lime juice dressing.
Add the red beans, jalapeño pepper, bell pepper, corn kernels, scallion and cilantro. Stir well.
Serve immediately or if you prefer the salad to be chilled, refrigerate for two to three hours prior to serving.