Several factors in making stainless steel signs2

Ferric chloride, active agent, water. The Baume degree of ferric chloride in the formula should be kept at about 42, and active agent 0 should be added per liter of ferric chloride solution. 8-1. 2 ml. The stainless steel bottom surface corroded by the formula is smooth and clean without black passivation film and hemp spots. The factors affecting the corrosion of ferric chloride solution to stainless steel are as follows: 1. The influence of concentration. Chemical corrosion is also called micro-battery corrosion. The more positive the redox potential is, the faster the corrosion rate is. With the increase of concentration, the oxidation-reduction potential becomes positive corrosion rate increases. Industrial grade ferric chloride has a negative redox potential due to its low purity. Only when the Baume degree reaches above 42 can the redox potential meet the requirements of corrosion of stainless steel. 2. Effect of pH value in solution on corrosion rate. Low pH value, stronger than stainless steel corrosion; When the pH value is too high, ferric chloride is hydrolyzed into ferric hydroxide precipitate and loses corrosion. The pH value of corrosive liquid should be adjusted to a certain extent in production. 3. Influence of corrosive liquid temperature. The higher the temperature of the corrosive liquid, the faster the corrosion rate. However, considering the bearing capacity of corrosion-resistant ink, the temperature should be controlled at 30--It is advisable between 40 °c.