" Trivalent chromium passivation shall be used unless written exception or specification update provided . "
要应用三价铬的钝化,有书面指出的例外或规格更新时除外。
The electrochemistry behavior , surface microstructure and forming process of trivalent chromium passivation film were studied by electrochemical methods , scanning electron microscopy and x-ray photoelectron spectroscopy .
When the metal coating is punctured or scratched , the capsules in the damaged area burst and ooze restorative liquids , in the form of compounds called trivalent chromates .
The resulting " trivalent " vaccine provokes the patient 's immune system into producing antibodies , and that primes it for an attack by the worrying strains of flu .