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Originally Posted by trish07

Not it is not only surface rust. Parts of it are eated by rust, especially the welds.

that sounds typical for any wield.

the engineering vocab you need to support your clam is
“though 409SSS may have developed a surface oxide layer to protect the corrosion from farther penetrating the sub surface, the wielded area are subject to galvanic corrosion due the wield rod material and the heat effected zone during wielding have alter the materials chemical composition which resist further oxide development. When such material combinations is subject to an high salt environment, detrimental corrosion will occur. This theory can be verified through testing the 409SS wielded coupon material per mil-std-810 salt fog test.”