Solution Review: Finding the Second Maximum Value in an Array

fn find_second_maximum(arr: &[i32]) -> i32 {
    let mut mx = i32::MIN; 
    let mut second_mx = i32::MIN; 
    for i in 0..arr.len(){
        if arr[i] > mx {
            mx = arr[i]
        }
    }
    for i in 0..arr.len(){
        if arr[i] > second_mx && arr[i] < mx{
            second_mx = arr[i];
        }
    }
    second_mx
}