I think our mill can accept to analyze but you must ask SPN to cut a segment around the defective area for us. It shall not cut by gas cutting.
Frankly speaking from my experience facing such kind of this defect, it does not cause by material. It always come from heat treatment or production. But mostly caused from production. In order to judge whether heat treatment or production process problem, we need to have all heat treatment process(temperature) and also nitriding process.
Anyway, most of problem came from production. Can you have data of end-user’s die casting machine? Whether it is operated by automatic control or by manual. I ask this question because the corrosion is chemical reaction and it always causes by not suitable temperature of Aluminium liquid. In the past end-user always has problem with temperature check and pre-heat procees. End-use always push out the problem to supplier.
Dear K. AKe,
Please follow-up material from K. Kong.