The dark chromium oxide thus slowly replaces and covers the yellow color of the lead chromate
, causing the bright yellow areas in paintings to turn dark brown.
The suspended NH3 and hydrogen chloride can recombine in the atmosphere and form small particles of ammonium chloride which can settle on and contaminate the chromate
bath or the water used for quenching stages as well as all galvanized pieces lying on the floor.
CONCLUSIONS: These data illustrate that repetitive exposure to particulate chromate
induces chronic injury and an inflammatory microenvironment that may promote Cr(VI) carcinogenesis.
From the results we have so far, I am certain that we can develop a viable treatment for former industrial sites where chromate
compounds are a problem," said Dr Stewart.
Major studies pinpointing Cr(VI) as a human lung carcinogen have been performed on workers involved in chromate
pigment production and chromium plating.
Inorganic yellow pigments based on bismuth provide heat stability requisite for engineering thermoplastics to replace lead chromates
Most viable reformulations have already taken place; thus, declines in chromate
pigments will slow as they are replaced by various organic and complex inorganic types.
All units are phosphate washed, caulked with polyurethane sealant to prevent rust in seams, and painted with an epoxy primer using an acrylic enamel paint that is lead and chromate
Most of be emphasis is centered on the traditional metal oxides, such as chromate
or permanganate salts, in spite of the hazards and waste management concerns associate with them.
All units feature V-shaped chromate
treated condensers and low noise fans (2dBA less than R22 models), double antifreeze protection and optimum water distribution.
species is of particular concern because of its appreciable migratory potential and the resultant threat to groundwater supplies.
It still has the telltale green of aviation zinc chromate
paint on one side.