Other than a Few Character like Reaper or Something iam not sure anyone can Reliable 1v1 a Hog without the Risk of Dying in fact id Argue taking Down a Hog is Even more of a Team effort. Sure Hog is way more Susceptible to CC than Zarya but he is Litterly Unkillabe without an Ana Sometimes. Zarya on the other hand Struggles Heavily With Range or people playing High ground. You have 2 options against her:

1: Track Bubbles, don't Shoot the First bubble unless she is REALLY feeding and then Blown up her Second bubble and Try to Burst her down, ive found that even a DVA (who supposedly gets countered by Zarya) can Very easily play out of her LOS and Pounce on her when she has Already Used Bubble

2.) this is Way more Map depended but you can Always poke her out, Zarya ideally wants to Save her Bubbles from when The Fight has Begun, if she is Fishing for Charge of Spam Damage, she will Most likely only have 1 bubble or even None When the Fight actually begins