Affect of EP Additives on Bronze gears
Affect of EP Additives on Bronze gears
(OP)
I have heard reports that there can be serious corrosion problems in copper based alloy gears in the presence of EP packages containing sulfur and phosphorus compounds. Can anybody provide any references to these issues?





RE: Affect of EP Additives on Bronze gears
RE: Affect of EP Additives on Bronze gears
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RE: Affect of EP Additives on Bronze gears
Much more relevant than the last... put together these two excerpts. The short version:
1 EP contains active sulfur.
2 Sulferized mineral oils are corrosive to yellow metals
The long version (direct quote)
1 - "Modern EP gear oils are formulated with additives that contain active sulfur, frequently combined with phosphorus, to provide a thermally stable, noncorrosive lubricant with high load-carrying capacity."
2 - "Sulfurized mineral oil and other highly reactive forms of sulfur have the advantage of forming protective metal films at lower temperatures than other sulfur-containing additives. On the downside, they are corrosive to certain metal and metal alloys, particularly yellow metals, which contain copper as a major alloying element. "
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RE: Affect of EP Additives on Bronze gears