Here's how to keep the cast iron guardrail longer:
1. Cast iron guardrail needs to be cleaned, polished and finally sprayed with antirust paint.
2. The surface of cast iron guardrail should be pickled.
3。 Dust the outer layer of cast iron guardrail regularly。 It is better to use soft cotton cloth for dust removal。
4 .要注意防潮。 因近年我国大部分地区酸雨肆虐，雨后应立即把残留在铸铁护栏上的雨水擦干，虽然有点麻烦，但这招很管用。能使铸铁围墙的外层不受侵害。 5.防腐蚀，尽量避免酸性、碱性化学物品接触铸铁护栏的外表。
4. Pay attention to damp proof. Since acid rain is rampant in most areas of China in recent years, the residual rainwater on the cast iron guardrail should be wiped off immediately after the rain. Although it is a bit troublesome, it is very effective. It can protect the outer layer of cast iron fence. 5. Anti corrosion, try to avoid acid, alkaline chemicals contact the surface of cast iron guardrail.
The above is how to keep the cast iron guardrail longer, I hope you have some understanding.