I mean, you literally just said in your post that the bluing takes a certain amount of time to properly complete. "Thin" isn't really the best description but most people will understand it. It chemically hardens and oxidizes the outermost layer of steel to make it "inert" to corrosion, so if that isn't done for long enough (Remington cheaping out as it takes more production time) or if they don't neutralize it properly; there will be issues. It's as simple as that. Every process has to be done correctly to get correct results, and VERY obviously remington is NOT doing things to ISO9001 specifications, which is partly why they went right into the toilet and died.
If they did not leave the parts in the tanks long enough, they would not be black. The black finish is itself a type of "rust", in this case nitric salt oxidation that is only microns thick. If it is black, it was done correctly. If it's purple or brown, it was not. Brown would mean the process was done wrong and regular red rust is on the surface. Purple is either it was not in the bath long enough, or the nickel content in the steel was too high (I'm looking at you 1970's Rugers!!!).
Blueing "protects" a metal surface from rust by being already rusted, depriving the underlying metal from oxygen in moist environments (up to a point). Oil significantly improves the durability of these finishes. The surface texture options (from smooth to sandblasted) have tradeoffs - smooth finishes "shed" moisture, while rough ones retain oil. Over a longer period, oil retention is usually a superior choice to moisture shedding - assuming the operator regularly oils the gun, that is.
Also, bluing does not harden a surface at all. It's a cosmetic and protective finish only, it does not change surface hardness by any appreciable amount.
ISO9001, by the way, is not a bluing specification. The ISO 9000 series specs are about process repeatability - in other words, they do the process the same way every time. I have no idea if the new Remarms company is ISO certified or not, but the old Illion plant was.
Lastly, Remington "died" because they were owned by an investment company for several years (Cerberus) that knew NOTHING about running a gun manufacturer and was more interested in raiding the company for its best assets and then spinning off the carcass. Everything after that has been Remington's attempts to recover from that horrendous management experience.
If you look at a Wingmaster made right before the most recent bankruptcy, it's still a beautifully finished firearm that is well made and up to most reasonable people's standards. The reality, however, is that consumers wanted to pay about the same price for an Express as they would pay for a cheap Turkish aluminum bangstick and making a gun that cheaply involves plastic, MIM parts, less machining and fitting work, etc.
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