香蕉三级片免费_香蕉视频在线观看下载_香蕉视频下载免费_香蕉视频APP污免费下载 ,www国产无套内射com-麻1豆传媒2021精品-麻豆画精品传媒2021一二三

Corrosion prevention is the use of various methods to protect metal objects that are prone to rusting, in order to extend their service life. Generally, physical corrosion prevention, chemical corrosion prevention, electrochemical corrosion prevention, and other methods are used.

Lighting fixtures, motors, electric motors, distribution boxes, etc. all have certain requirements for corrosion resistance and must meet a certain level of corrosion resistance.

So, how is the anti-corrosion level classified? How to apply for anti-corrosion grade WF2?

The anti-corrosion level is classified into the following five levels according to indoor and outdoor:

For example, the anti-corrosion level WF2 of the lamp indicates that the lamp is suitable for outdoor strong corrosive environmental conditions.

Required documents for applying for WF2 anti-corrosion grade:

(1) Assembly drawing (including the material of the shell and exposed fasteners),

(2) Nameplate diagram,

(3) Surface coating material report,

(4) Coating process documents for coatings,

(5) Other materials,

(6) Sample.
Service Hotline: 18924609560 (same WeChat account)