| 单词 |
cathodic |
| 释义 |
cathodic, a.|kəˈθɒdɪk|
Also kath-.
[f. as prec. + -ic.]
1. Phys. Of nerve force: Proceeding from a nerve-centre; efferent.
1852M. Hall Diastaltic Nervous Syst. (Mayne).
2. Bot. (Of leaves arranged on the axis spirally.) See quots.
1882Vines Sachs' Bot. 190 If the spiral winds from right to left, the right edge of the leaves (as you ascend) is called the Kathodic, the left edge the anodic. Ibid. 199 So that..all the segments are broader on the anodic than on the kathodic side. 1884Bower & Scott De Bary's Phaner. & Ferns 238 Between the median and descending, or kathodic lateral bundle.
3. Electr.
a. Of or pertaining to a cathode.
1837[see anodic a. 1 a]. 1896Daily News 18 Jan. 5/4 Taking photographs with cathodic rays. 1951Engineering 13 Apr. 443/1 [In corrosion] If the water contains a salt..the products formed..at the cathodic (unattacked) part.. are freely soluble.
b. cathodic protection: protection of an underground or underwater structure from corrosion by a technique that causes the structure to act as the cathode of an electrolytic cell.
1931U.S. Bur. Standards Techn. News Bull. May 52/1 A number of soils..are severely corrosive with respect to the commonly used pipe materials. Four methods of preventing corrosion in these soils have been considered: (1) the surrounding of the pipes by noncorrosive soils transported from other regions; (2) electrical or cathodic protection; [etc.]. 1964Electronics Weekly 18 Nov. 24/3 The cathodic protection equipment..has been installed in a number of naval vessels. Designed to protect the ship's hull against corrosion..the system..sets up a current flow between a set of anodes and the ship's hull, which acts as the cathode. |
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