As a casting material, Fuzhou resin manhole cover is relatively easy to replay. Different resin manhole covers are made by dissolving because it is made of a single material. This is due to the ease of use of this replica and theft. Resin manhole covers are common on roads or floors. Resin manhole covers need to be reasonably maintained during use, otherwise some rust will easily occur. There are three main methods for the pollution treatment of resin manhole covers:
First, no solution treatment: the alloy elements have not been dissolved in the matrix, resulting in a low matrix alloy content and poor corrosion resistance. So pay attention to protective measures in this regard.
Second, the resin manhole cover is intergranular corrosion: This material containing no titanium and niobium has the tendency of intergranular corrosion. Adding titanium and niobium together with stable treatment can reduce intergranular corrosion. A high alloy steel that can resist corrosion in air or chemically corrosive media.
3. Chloride ions exist in the use environment of resin manhole covers: Chloride ions are widely present, such as salt, sweat, seawater, etc. In the environment in the presence of chloride ions, the corrosion is fast and even exceeds that of ordinary low carbon steel. Therefore, the use environment of the manhole cover has requirements, and it needs to be wiped frequently to remove dust and keep clean and dry.
If the resin manhole cover has been contaminated, use 5% -10% hydrochloric acid for soaking treatment, scrubbing and soaking. Repeat until the acidity and iron content of the soaking solution are basically unchanged.
Therefore, installing unnecessary additional costs to prevent the theft of resin manhole covers, clamping and security accidents inside manhole doors from being opened, because the theft is caused by manhole doors of vehicles or pedestrians, and even cast iron parts are energized during rain Because they are conductive, they sometimes cause electric shock.