Sql Server Powershell

[SecureString]$pwd = ConvertTo-SecureString '**P@55w0rd**' -AsPlainText -Force
[PSCredential]$cred = New-Object System.Management.Automation.PSCredential ('user', $pwd)

Or

 using namespace System.Management.Automation;

$Credential = [PSCredential]::new("UserName", (ConvertTo-SecureString "3nterY0urP@55w0rd!" -AsPlainText -Force));
$Credential | Export-Clixml -Path "c:\PathtTo\Credential.File"