THE CORROSION OF TITANIUM AND TITANIUM ALLOYS

Journal Article · Sat Sep 01 00:00:00 EDT 1956 · Technische Mitteilungen Krupp (West Germany) Divided into Tech. Mitt. Krupp, Forschungsber. and Tech. Mitt. Krupp, Werksber.

OSTI ID:4147511

Rudiger, O; Fischer, R W; Knorr, W

A survey of the corrosion chemical behavior of unalloyed Ti is given. The protective coating arising in various media was detected by electron diffraction diagrams, and the mechanism of the formation and dissolution of the protective layer is discussed. The voltage-time pattern of activated titanium in aqueous solutions and in air was determined, and the effect of water on the passivation of titanium was established. From current density potential measurements in 0.1N fluoride-containing sulfuric acid the passivation potential was determined to be -0.6 v and the activation potential to be -0.4 v. The protective layer occurring in anodic polarization can be identified only partially. In potential-time measurements of titanium previously passivated in water, a secondary passivation was found in hydrochloric acid. This passivation layer, once formed, exists up to 100 deg C whereas the primary passivation layer is destroyed at 40 deg C. The upper temperature range for the formation of this secondary laver was determined by establishment of the equilibrium rest potential for various temperatures and hydrochloric acid concentrations. By oriented corrosion investigations the effect of alloying addition on the corrosion behavior of titanium was determined. An improvement of the corrosion resistance in hydrochloric, sulfuric, and phosphoric acids was established for a molybdenum addition. An alloy with 30% molybdenum shows a better resistance in these media than Hastelloy C. (tr-auth)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-14-011938
• OSTI ID: 4147511
• Journal Information: Technische Mitteilungen Krupp (West Germany) Divided into Tech. Mitt. Krupp, Forschungsber. and Tech. Mitt. Krupp, Werksber., Vol. Vol: 14; Other Information: Orig. Receipt Date: 31-DEC-60
• Country of Publication: Country unknown/Code not available
• Language: German

Related Subjects

METALS, CERAMICS, AND MATERIALS
ACTIVATION
ADDITIVES
AIR
ANODES
CHEMICAL REACTIONS
COATING
CORROSION
DIFFRACTION
ELECTRONS
FILMS
FLUORIDES
HYDROCHLORIC ACID
MOLYBDENUM ALLOYS
PASSIVATION
PHOSPHORIC ACID
POLARIZATION
REACTION KINETICS
SOLUTIONS
SULFURIC ACID
TEMPERATURE
TITANIUM
TITANIUM ALLOYS
WATER