I don't know if the 6th epistle to the Philippians would make a keylink to Ephesians 6 but I found the study interesting.

I was wondering if there is a specific area in the bible where the armor of God is discussed so if there's one good place it is in Philippians.

The helmet protects the mind and salvation is none other than Jesus.

Philippians 2:5 Let this mind be in you, which was also in Christ Jesus:

Philippians 2:2 Fulfil ye my joy, that ye be likeminded, having the same love, [being] of one accord, of one mind.

Philippians 3
14
I press toward the mark for the prize of the high calling of God in Christ Jesus.
15 Let us therefore, as many as be perfect, be thus minded: and if in any thing ye be otherwise minded, God shall reveal even this unto you.

Philippians 4
2
I beseech Euodias, and beseech Syntyche, that they be of the same mind in the Lord.

Philippians 4
7
And the peace of God, which passeth all understanding, shall keep your hearts and minds through Christ Jesus.
8 Finally, brethren, whatsoever things are true, whatsoever things [are] honest, whatsoever things [are] just, whatsoever things [are] pure, whatsoever things [are] lovely, whatsoever things [are] of good report; if [there be] any virtue, and if [there be] any praise, think on these things.
9 Those things, which ye have both learned, and received, and heard, and seen in me, do: and the God of peace shall be with you.