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Nonmetallic coatings

Uniform and pitting-type corrosion of various materials (carbon steels, stainless steels, aluminum, etc.) could be characterized in terms of noise properties of the systems fluctuation amplitudes in the time domain and spectral power (frequency dependence of power) of the fluctuations. Under-film corrosion of metals having protective nonmetallic coatings could also be characterized. Thus, corrosion research was enriched by a new and sufficiently correct method of looking at various aspects of the action of corrosive media on metals. [Pg.628]

Coatings and Linings The use of nonmetallic coatings and lining materials in combination with steel or other materials has and will continue to be an important type of construction for combating corrosion. [Pg.11]

Several corrosion inhibitors such as polyamide, polyamine, dithiocarbamate, thiophosphate ester, organic acid, sulfide, and selenide types have all been tried in methanol without significant success [3.5]. Similarly, nonmetallic coatings of metals to effectively prevent corrosion have not been developed to date. One application where coatings have proven effective is in prevention of anodic dissociation of fuel pumps immersed in methanol. Since methanol is many times more conductive than gasoline, components such as fuel pumps and electrical fuel level gauges can cause induced currents that in turn remove metal from these... [Pg.81]

As has been indicated, mixer choice frequently is a matter of experience or experiment. Consequently, the tabulated data of Valentine and MacLean, in which specific recommendations for certain mixing ranges are made, should be of great value. Practically any material of construction may be used in a mixer. Mild steel is the most common material, but almost all the special metals and alloys, as well as nonmetallic coatings, can be used. [Pg.541]

The application of metallic and nonmetallic coatings or linings to the surface which protects against corrosion, but allows the material to retain its structural strength (for example, a carbon steel pressure vessel with stainless steel cladding as a liner). [Pg.84]

Buhhling The presence of bubbles of trapped air and/or volatile vapors in nonmetallic coating or plastic specimen or article. Bubbling is often caused by improper application or excessive mixing of paints or degassing. [Pg.188]

N. P. Myagkov, Colloid-Chemical and Electrochemical Properties of Nonmetallic Coatings, Candidate s Dissertation, Rizhsk, Politekh. Inst., Riga (USSR) (1961). [Pg.434]

Materials tests and standards of nonmetallic organic and inorganic coatings systems on corrodible substrates are described. Coatings systems may provide many properties in addition to corrosion resistance, e.g., appearance, insulation, smd tack. Although test methods exist for a wide variety of coatings characteristics, the primary nonmetallic coatings tests addressed herein evaluate corrosion resistance, adhesion, and physical/chemical durability. [Pg.632]

Pores and active defects in nonmetallic coatings can be revealed by color indication or deposit fomation. On nickel substrates, dimethylglyoxime, or steel, potassium ferricyanide (ferroxyl test) indicator can be applied to surface on filter paper while substrate is made the anode. Alternatively, a substrate immersed in acidic copper sulfate can be made the cathode to form copper nodules at conductive coatings defects. [Pg.633]

The overall reaction takes place at a rate determined by the more difficult of these two steps. This simple concept, independent anodic and cathodic half-reactions, is the basis of the electrochemical mechanism of corrosion. The mechanism has profound effects on the corrosion protective properties of nonmetallic coatings materials. Some tests exploit the electrochemical mechanism to determine specific corrosion susceptibilities of coatings systems such as cathodic disbond-ment and pinhole detection. Coatings that are permeable to oxygen may be vulnerable to damage due to an alternative cathodic reaction... [Pg.633]

R.D. Granata, Nonmetallic Coatings, Corrosion Tests and Standards Application and Interpretation, R. Baboian, Ed., ASTM, 1995, p 525-530... [Pg.41]


See other pages where Nonmetallic coatings is mentioned: [Pg.652]    [Pg.352]    [Pg.137]    [Pg.283]    [Pg.587]    [Pg.590]    [Pg.219]    [Pg.619]    [Pg.47]    [Pg.73]    [Pg.3]    [Pg.8]    [Pg.159]    [Pg.632]    [Pg.632]    [Pg.632]    [Pg.633]    [Pg.635]    [Pg.673]    [Pg.219]    [Pg.623]    [Pg.36]    [Pg.235]    [Pg.957]    [Pg.708]    [Pg.288]    [Pg.290]    [Pg.292]   
See also in sourсe #XX -- [ Pg.632 , Pg.633 , Pg.634 , Pg.635 ]




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