Modify this powershell script to loop through an array of servers and then db list.

$SQLAdminUser = 'AdminUser'

$SQLAdminPwd = get-content "PathToSecuredCredentials.txt" | convertto-securestring

$srvConn = New-Object('Microsoft.SqlServer.Management.Common.ServerConnection') ('ServerName', $SQLAdminUser, $SQLAdminPwd)

$srv = New-Object ('Microsoft.SqlServer.Management.Smo.Server') $srvConn

$srv.Databases | where{$_.Name -eq 'DatabaseName'} |

foreach {

$_.SetOwner('sa')

$_.Alter();

}